President Obama Calls for 'Collective Action'

Invoking the nation's founding values, President Obama marked the start of his second term today with a sweeping call for "collective action" to confront the economic and social challenges of America's present and future.

"That is our generation's task, to make these words, these rights, these values -- of life, and liberty, and the pursuit of happiness -- real for every American," Obama said in an inaugural address delivered from the west front of the U.S. Capitol.

"Being true to our founding documents does not require us to agree on every contour of life; it does not mean we will all define liberty in exactly the same way, or follow the same precise path to happiness. Progress does not compel us to settle centuries-long debates about the role of government for all time," he said, giving nod to the yawning partisan divide.

"But it does require us to act in our time."

The call to action, on the eve of what's shaping up to be another contentious term with Republicans and Congress, aimed to reset the tone of debate in Washington and turn the page on the political battles of the past.

Pablo Martinez Monsivais/AP Photo

Inauguration 2013: President Obama's Opportunities Watch Video

Official Oath of Office 2013: President Obama Watch Video

"For now decisions are upon us, and we cannot afford delay. We cannot mistake absolutism for principle, or substitute spectacle for politics, or treat name-calling as reasoned debate," Obama said. "We must act, knowing that our work will be imperfect."

The address, lasting a little less than 20 minutes, laid out in broad terms Obama's vision for the next four years, alluding to looming policy debates on the war in Afghanistan, deficit reduction, immigration, and overhaul of Social Security and Medicare.

Obama also became the first president, at least in recent inaugural history, to make explicit mention of equality for gay and lesbian Americans. He made repeated mentions of "climate change," something no president has said from such a platform before.

The president stuck closely to his campaign themes, offering few new details of his policy proposals, however. Those are expected to come next month in the State of the Union address Feb. 12.

Hundreds of thousands packed the National Mall in chilly 40-degree temperatures and brisk wind to hear Obama's remarks and witness the ceremonial swearing-in. While the crowds were smaller than four years ago, the U.S. Park Police said the Mall reached capacity and was closed shortly before Obama took the podium.

Shortly before the address, Obama placed his left hand on the stacked personal Bibles belonging to President Abraham Lincoln and Dr. Martin Luther King Jr., and raised his right to repeat the oath administered by Supreme Court Chief Justice John Roberts.

"I, Barack Hussein Obama, do solemnly swear that I will faithfully execute the office of president of the United States," he said, "and will to the best of my ability, preserve, protect and defend the Constitution of the United States."

Obama and Biden were both officially sworn in during private ceremonies Sunday, Jan. 20, the date mandated by the Constitution for presidents to begin their terms.

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Quadruple DNA helix discovered in human cells

Sixty years after James Watson and Francis Crick established that DNA forms a double helix, a quadruple-stranded DNA helix has turned up.

Quadruple helices that intertwine four, rather than two, DNA strands had been made in the laboratory, but were regarded as curiosities as there was no evidence that they existed in nature. Now, they have been identified in a range of human cancer cells.

The four-stranded packages of DNA, dubbed G-quadruplexes, are formed by the interaction of four guanine bases that together form a square. They appear to be transitory structures, and were most abundant when cells were poised to divide. They appeared in the core of chromosomes and also in telomeres, the caps on the tips of chromosomes that protect them from damage.

Because cancer cells divide so rapidly, and often have defects in their telomeres, the quadruple helix might be a feature unique to cancer cells. If so, any treatments that target them will not harm healthy cells.

"I hope our discovery challenges the dogma that we really understand DNA structure because Watson and Crick solved it in 1953," says Shankar Balasubramanian of the University of Cambridge, UK.

Tagged with antibodies

Balasubramanian's team identified the four-stranded structures in cancer cells with the help of an antibody that attaches exclusively to G-quadruplexes. To stop them from unravelling into the ordinary DNA, they exposed the cells to pyridostatin, a molecule that traps quadruple helices wherever they form.

This enabled the researchers to count how many formed at each stage of cell multiplication. The G-quadruplexes were most abundant in the "S-phase" – when cells replicate their DNA just prior to dividing.

"I expect they will also exist in normal cells, but I predict that there will be differences with cancer cells," says Balasubramanian. His hunch is that the G-quadruplexes are triggered into action by chaotic genomic mutations and reorganisations typical of cancerous or precancerous cells.

"This research further highlights the potential for exploiting these unusual DNA structures to beat cancer, and the next part of this is to figure out how to target them in tumour cells," says Julie Sharp of Cancer Research UK, which funded the research.

Another important question that Balasubramanian's and other teams will try to answer is whether G-quadruplexes play a role in embryo development, and whether such a role is mistakenly reactivated in cancer cells. "We plan to find out whether the quaduplexes are a natural nuisance, or there by design," he says.

Journal reference: Nature Chemistry, DOI: 10.1038/NCHEM.1548

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Japan govt says no confirmation on nine dead in Algeria

TOKYO: Japan's government said Monday it was aware of reports that nine Japanese had died in the desert standoff in Algeria, but had no confirmation of the fate of 10 of its nationals who remain unaccounted for.

In a midnight press conference, chief government spokesman Yoshihide Suga told reporters vice foreign minister Minoru Kiuchi had arrived at an airport near the gas facility that was over-run by Islamist gunmen last week.

He said Kiuchi would go into the complex and to a hospital in the town of In Amenas in an effort to determine what had happened.

The press conference came after a witness in In Amenas told AFP he knew of nine Japanese people killed during the 72-hour hostage crisis.

"We are aware of such information, but we have not confirmed any such numbers," Suga told reporters.

He said Kiuchi was with the president of contracting firm JGC, which employed 17 Japanese nationals in the area, and would be joined by another team from Japan who would work to confirm what had happened to hostages.

Suga said those known to have made it to safety would be flown back to Japan.

"To help the seven Japanese whose safety was confirmed return home, we plan to dispatch a government aircraft there," he said.

The bodies of 25 hostages have been found in and around the gas plant by Algerian forces as they mopped up at what appeared to be the end of the three-day stand-off.

Thirty-two kidnappers were also killed and the army freed 685 Algerian workers and 107 foreigners, said Algeria's interior ministry. The government in Algiers has warned the death toll could rise.

-AFP/ac

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Texting newscaster falls into freezing canal

Here's one of Birmingham's picturesque canals.

(Credit:
Voxley19/YouTube Screenshot by Chris Matyszczyk/CNET)

Let's try and make some excuses.

She's a newscaster, so she's so used to focusing on words written down that she loses track of everything else.

She was texting her boyfriend, who is so astoundingly gorgeous that she would have walked through morning traffic in Manhattan just to send him an "LOL."

No, it's no good.

Laura Safe (this is, indeed, her real name) is the latest in the annals of people who almost did themselves permanent damage because they were too busy texting to see where they were going.

While one of the previous surviving wet texters fell into Lake Michigan, Safe merely fell into a canal in Birmingham, England.

This happens to be my home town, so may I tell you that it's like Venice without the beauty or the wonderful literature written about its detectives.

Safe, being a newscaster for Capital FM radio there, must have known there was a canal or two sprinkled about. (Birmingham has 114 miles of them.)

However, as she wandered down the steps of a shopping mall, she was busily staring into her phone, texting her man.

More Technically Incorrect

As the Daily Mail tells it, another man, property company founder Neil Edgington, watched her heading down the steps and inexorably toward the freezing canal and shouted for her to stop.

It appears she didn't listen. It appears Edgington may have ruined his suit in saving her.

After being rescued by Edgington from the wet and cold, Safe told the Mail: "I was there on the edge, teetering on the edge, moving my arms around, trying to save myself from falling into this horrendous canal which is most probably full of, well I don't know what's in there."

But we know what was in there: an engrossed texting newscaster by the name of Safe.

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Attack at Algeria Gas Plant Heralds New Risks for Energy Development

The siege by Islamic militants at a remote Sahara desert natural gas plant in Algeria this week signaled heightened dangers in the region for international oil companies, at a time when they have been expanding operations in Africa as one of the world's last energy frontiers. (See related story: "Pictures: Four New Offshore Drilling Frontiers.")

As BP, Norway's Statoil, Italy's Eni, and other companies evacuated personnel from Algeria, it was not immediately clear how widely the peril would spread in the wake of the hostage-taking at the sprawling In Amenas gas complex near the Libyan border.

Map by National Geographic

Algeria, the fourth-largest crude oil producer on the continent and a major exporter of natural gas and refined fuels, may not have been viewed as the most hospitable climate for foreign energy companies, but that was due to unfavorable financial terms, bureaucracy, and corruption. The energy facilities themselves appeared to be safe, with multiple layers of security provided both by the companies and by government forces, several experts said. (See related photos: "Oil States: Are They Stable? Why It Matters.")

"It is particularly striking not only because it hasn't happened before, but because it happened in Algeria, one of the stronger states in the region," says Hanan Amin-Salem, a senior manager at the industry consulting firm PFC Energy, who specializes in country risk. She noted that in the long civil war that gripped the country throughout the 1990s, there had never been an attack on Algeria's energy complex. But now, hazard has spread from weak surrounding states, as the assault on In Amenas was carried out in an apparent retaliation for a move by French forces against the Islamists who had taken over Timbuktu and other towns in neighboring Mali. (See related story: "Timbuktu Falls.")

"What you're really seeing is an intensification of the fundamental problem of weak states, and empowerment of heavily armed groups that are really well motivated and want to pursue a set of aims," said Amin-Salem. In PFC Energy's view, she says, risk has increased in Mauritania, Chad, and Niger—indeed, throughout Sahel, the belt that bisects North Africa, separating the Sahara in the north from the tropical forests further south.

On Thursday, the London-based corporate consulting firm Exclusive Analysis, which was recently acquired by the global consultancy IHS, sent an alert to clients warning that oil and gas facilities near the Libyan and Mauritanian borders and in Mauritania's Hodh Ech Chargui province were at "high risk" of attack by jihadis.

"A Hot Place to Drill"

The attack at In Amenas comes at a time of unprecedented growth for the oil industry in Africa. (See related gallery: "Pictures: The Year's Most Overlooked Energy Stories.") Forecasters expect that oil output throughout Africa will double by 2025, says Amy Myers Jaffe, executive director of the energy and sustainability program at the University of California, Davis, who has counted 20 rounds of bidding for new exploration at sites in Africa's six largest oil-producing states.

Oil and natural gas are a large part of the Algerian economy, accounting for 60 percent of government budget revenues, more than a third of GDP and more than 97 percent of its export earnings. But the nation's resources are seen as largely undeveloped, and Algeria has tried to attract new investment. Over the past year, the government has sought to reform the law to boost foreign companies' interests in their investments, although those efforts have foundered.

Technology has been one of the factors driving the opening up of Africa to deeper energy exploration. Offshore and deepwater drilling success in the Gulf of Mexico and Brazil led to prospecting now under way offshore in Ghana, Mozambique, and elsewhere. (See related story: "New Oil—And a Huge Challenge—for Ghana.") Jaffe says the Houston-based company Anadarko Petroleum has sought to transfer its success in "subsalt seismic" exploration technology, surveying reserves hidden beneath the hard salt layer at the bottom of the sea, to the equally challenging seismic exploration beneath the sands of the Sahara in Algeria, where it now has three oil and gas operations.

Africa also is seen as one of the few remaining oil-rich regions of the world where foreign oil companies can obtain production-sharing agreements with governments, contracts that allow them a share of the revenue from the barrels they produce, instead of more limited service contracts for work performed.

"You now have the technology to tap the resources more effectively, and the fiscal terms are going to be more attractive than elsewhere—you put these things together and it's been a hot place to drill," says Jaffe, who doesn't see the energy industry's interest in Africa waning, despite the increased terrorism risk. "What I think will happen in some of these countries is that the companies are going to reveal new securities systems and procedures they have to keep workers safe," she says. "I don't think they will abandon these countries."

This story is part of a special series that explores energy issues. For more, visit The Great Energy Challenge.

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Obama, Biden Sworn In for Second Term

President Barack Obama and Vice President Joe Biden today officially embarked on their second term, taking the Constitutionally mandated oath of office in two separate private ceremonies inside their homes.

Shortly before noon in the Blue Room of the White House, Obama raised his right hand, with his left on a family Bible, reciting the oath administrated by Chief Justice John Roberts. He was surrounded by immediate family members, including first lady Michelle Obama and daughters, Malia and Sasha.

"I did it," he said to his daughters after taking the oath.

Biden was sworn in earlier today by Justice Sonia Sotomayor, the first Hispanic to administer a presidential oath, in a ceremony at his official residence at the U.S. Naval Observatory. He was joined by more than 120 guests, including cabinet members, extended family and his wife, Dr. Jill Biden.

Because Jan. 20 -- the official date for a new presidential term -- falls on a Sunday this year, organizers delayed by one day the traditional public inauguration ceremony and parade down Pennsylvania Avenue.

Michael Reynolds-Pool/Getty Images

Vice President Joe Biden Sworn in for 2nd Term Watch Video

President Obama's 2nd Inauguration: Hundreds of Thousands to Attend Watch Video

Obama and Biden will each repeat the oath on Monday on the west front of the Capitol, surrounded by hundreds of dignitaries and members of Congress. An estimated 800,000 people are expected to gather on the National Mall to witness the moment and inaugural parade to follow.

The dual ceremonies in 2013 means Obama will become the second president in U.S. history to take the presidential oath four times. He was sworn in twice in 2008 out of an abundance of caution after Roberts flubbed the oath of office during the public administration. This year Roberts read from a script.

Franklin Roosevelt was also sworn in four times but, unlike Obama, he was elected four times.

This year will mark the seventh time a president has taken the oath on a Sunday and then again on Monday for ceremonial purposes. Reagan last took the oath on a Sunday in 1985.

Both Obama and Biden took the oath using a special family Bible. Obama used a text that belonged to Michelle Obama's grandmother LaVaughn Delores Robinson. Biden placed his hand on a 120-year-old book with a Celtic cross on the cover that has been passed down through Biden clan.

The official inaugural activities today also included moments of prayer and remembrance that marked the solemnity of the day.

Obama and Biden met at Arlington National Cemetery for a brief morning ceremony to place a wreath on the Tomb of the Unknowns, honoring military service members who served and sacrificed. The men stood shoulder to shoulder, bowing their heads as a bugler played "Taps."

Biden, who is Catholic, began the day with a private family mass at his residence. The president and first family attended church services at Metropolitan African Methodist Episcopal Church, a historically black church and site of two pre-inaugural prayer services for former President Bill Clinton and Vice President Al Gore and their families.

The Obamas and Bidens plan to participate in a church service on Monday morning at St. John's Episcopal, across Lafayette Park from the White House. They will also attend a National Prayer Service on Tuesday at the National Cathedral.

Later on Sunday evening, the newly-inaugurated leaders will attend a candlelight reception at the National Building Museum. The president and vice president are expected to deliver brief remarks to their supporters.

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Earth may be crashing through dark matter walls

Earth is constantly crashing through huge walls of dark matter, and we already have the tools to detect them. That's the conclusion of physicists who say the universe may be filled with a patchwork quilt of force fields created shortly after the big bang.

Observations of how mass clumps in space suggest that about 86 per cent of all matter is invisible dark matter, which interacts with ordinary matter mainly through gravity. The most popular theory is that dark matter is made of weakly interacting massive particles.

WIMPs should also interact with ordinary matter via the weak nuclear force, and their presence should have slight but measurable effects. However, years of searches for WIMPs have been coming up empty.

"So far nothing is found, and I feel like it's time to broaden the scope of our search," says Maxim Pospelov of the University of Victoria in Canada. "What we propose is to look for some other signatures."

Bubbly cosmos

Pospelov and colleagues have been examining a theory that at least some of the universe's dark matter is tied up in structures called domain walls, akin to the boundaries between tightly packed bubbles. The idea is that the hot early universe was full of an exotic force field that varied randomly. As the universe expanded and cooled, the field froze, leaving a patchwork of domains, each with its own distinct value for the field.

Having different fields sit next to each other requires energy to be stored within the domain walls. Mass and energy are interchangeable, so on a large scale a network of domain walls can look like concentrations of mass – that is, like dark matter, says Pospelov.

If the grid of domain walls is packed tightly enough – say, if the width of the domains is several hundred times the distance between Earth and the sun – Earth should pass through a domain wall once every few years. "As a human, you wouldn't feel a thing," says Pospelov. "You will go through the wall without noticing." But magnetometers – devices that, as the name suggests, measure magnetic fields – could detect the walls, say Pospelov and colleagues in a new study. Although the field inside a domain would not affect a magnetometer, the device would sense the change when Earth passes through a domain wall.

Dark matter walls have not been detected yet because anyone using a single magnetometer would find the readings swamped by noise, Pospelov says. "You'd never be able to say if it's because the Earth went through a bizarre magnetic field or if a grad student dropped their iPhone or something," he says.

Network needed

Finding the walls will require a network of at least five detectors spread around the world, Pospelov suggests. Colleagues in Poland and California have already built one magnetometer each and have shown that they are sensitive enough for the scheme to work.

Domain walls wouldn't account for all the dark matter in the universe, but they could explain why finding particles of the stuff has been such a challenge, says Pospelov.

If domain walls are found, the news might come as a relief to physicists still waiting for WIMPs to show up. Earlier this month, for instance, a team working with a detector in Russia that has been running for more than 24 years announced that they have yet to see any sign of these dark matter candidates.

Douglas Finkbeiner of the Harvard-Smithsonian Center for Astrophysics, who was not involved in Pospelov's study, isn't yet convinced that dark matter walls exist. But he is glad that physicists are keeping an open mind about alternatives to WIMPs.

"We've looked for WIMP dark matter in so many ways," he says. "At some point you have to ask, are we totally on the wrong track?"

Journal reference: Physical Review Letters, DOI: 10.1103/PhysRevLett.110.021803

If you would like to reuse any content from New Scientist, either in print or online, please contact the syndication department first for permission. New Scientist does not own rights to photos, but there are a variety of licensing options available for use of articles and graphics we own the copyright to.

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Badminton: Lee Chong Wei reaches Malaysia Open finals

KUALA LUMPUR: World number one Lee Chong Wei dropped his first game of the tournament Saturday as he overcame Denmark's Jan O Jorgensen to secure a place in the finals of the Malaysia Badminton Open.

The home favourite, bidding for record ninth Malaysia Open title, dropped the second game to the determined and energetic 26-year-old emerging Dane, but eventually won through 21-13, 17-21, 21-12.

"It was indeed a tough match and Jan pushed me hard," said Lee, 30, who will now face Indonesia's Sony Dwi Kuncoro in the final.

"I haven't faced him in over a year but he has bounced back from his injuries to break into the top five in the world. So I'm expecting another tough match."

Kuncoro, a three-time Asian champion, was ranked as low as number 79 in the world ten months ago but is now in top form after battling back from back and leg injuries.

The 29-year-old, a bronze medallist in the 2004 Athens Olympics, will move up to number four when the new world rankings are announced next week.

Kuncoro advanced to the final by beating Japan's Kenichi Tago 21-12, 19-21, 23-21.

"I'm delighted to be back in the mix of a Superseries final. A year ago, my career was in jeopardy due to all my injuries but I've buckled down and I'm happy with my progress," he said.

In the women' singles, China's Yao Xue will be in her first Superseries final after beating South Korea's Bae Yeon-Ju 21-15, 21-18 in 34 minutes.

Yao, who turned 22 on Thursday, will take on 18-year-old Tai Tzu-ying of Taiwan, who stunned Indian top seed Saina Nehwal 22-20, 21-14.

"I never expected to come this far in this tournament. I had to come through the qualifying rounds and to reach the final is a big bonus for me," Yao said.

Chinese pair Bao Yixin/Tian Qing beat Indonesia's Lejarsar Variella Aprilsasi Putri/Marissa Vita 21-13, 21-17 to book a berth in the women's doubles finals.

The Chinese pair will face Japan's Misaki Matsutomo and Ayaka Takahashi. The Japanese players had earlier defeated Singapore's Shinta Mulia Sari and her partner Yao Lei 22-20, 21-14.

- AFP/de

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Recalibrate your expectations of how good an in-ear headphone can sound

I've been listening to Jerry Harvey's custom-molded in-ear headphones for years. The very first one, the UE10, was a game changer; in 2006 it was the best sounding in-ear headphone I'd heard. Now with his new Freqphase JH13 and JH16 in-ears, Harvey's done it again. The performance gains in clarity, detail, resolution, and stereo imaging are huge -- the adrenaline-pumping sound of the music you love over a set of Harvey's headphones can't be matched by any other in-ear 'phones.

The Jerry Harvey JH13 Freqphase in-ear headphone.

(Credit:
Steve Guttenberg/CNET)

Years before he made headphones, Harvey mixed stage monitor sound for Kiss, Van Halen, David Lee Roth, The Cult, KD Lang, Linkin Park, and many others, and that background led to his inventing the in-ear stage monitor/headphone. He founded Ultimate Ears, but now runs Jerry Harvey Audio. The man's passion for great sound knows no bounds, and he still makes time to hit the road. Harvey was on the Van Halen tour from January through June of 2012. Perfecting in-ear headphone design balanced with working with live music keep Harvey in the game.

The new $1,099 "Freqphase" JH13 and $1,149 JH16 headphones use the same types of balanced armature drivers that were in the older JH Audio models, but everything else has been redesigned. There's a new crossover network for the separate bass, midrange, and treble drivers, and the silicone tubes that direct the sound out to your ears are tuned in a new way. My photo comparing the old and new JH13 shows how different the two headphones are.

The new JH13 nails the sound of drums' dynamic attack and punch like no other in-ear I've tested. I don't spend a lot of time listening to very loud music, but I will say the Freqphase headphones sound amazing when cranked way up. The sound never turns harsh or aggressive. Listening at saner levels, the resolution is still quite extraordinary. Classical music was well served by the new headphones' sound.

The new JH13 (left), compared with the original JH13 (right).

(Credit:
Steve Guttenberg/CNET)

I'm hearing finer details of the mixes of favorite old recordings that I've heard hundreds of times, which makes the recordings sound fresher and sometimes better than I thought they were. The Freqphase JH16's sound is similar, but it has more low bass punch and impact than the JH13. The original JH16's bass could sometimes be overwhelming and too thick for my taste, but the new '16's bass definition is excellent.

I did the bulk of my listening for these tests with the headphones plugged into my
iPod Classic, listening to Apple Lossless files. I also tried the Freqphase headphones with my ALO Rx-Mk3B portable headphone amp and AlgoRhythm Solo digital-to-analog converter. The gains in see-through transparency and sheer believability of the sound were impressive, but I didn't want to get side-tracked by what the separate amp and DAC brought to the sound, so I continued with just the
iPod Classic.

Sure, the better universal-fit in-ear headphones, such as the $400 Ultimate Ears UE 900, which also use separate bass, midrange and treble balanced armature drivers can sound great. It's the best-sounding universal fit I've heard for the money, but it pales in comparison to the JH13. The UE 900 doesn't block external noise as effectively; it has limited dynamics and bass definition/power, and reduced high-frequency extension and "air" so the Black Keys' raunchy blues are scaled back. The JH13 lets the 'Keys rock out more; the difference is far from subtle. I still love the UE 900 and recommend it in its price point, but if you can afford a great custom like the JH13 or JH16 you won't be sorry.

JH Audio offers only headphones that are custom-molded to your ear canals -- they don't make universal-fit headphones. To have a set of customs made you need to first visit an audiologist to have "impressions" of your ear canals made and sent to JH Audio's factory in Apopka, Florida. Custom headphones block external noise better than universal-fit models, so you can turn down the volume when listening in noisy environments. Customs are as effective as battery-powered noise-canceling headphones, and sound better.

The JH13's sound is a revelation, but how does it compare with full-size audiophile headphones, like the $1,000 Sennheiser HD 700? The JH13 was really good, but the HD 700 was more relaxed, richer, fuller, and even more open sounding. Still, I'd never use the HD 700 in the subway, plugged into my iPod.

My $2,000 UE Personal Reference Monitors (PRM) were "designed" by me, and built with the equalization curves I selected. My PRMs sound absolutely amazing, but the JH13s' clarity and soundstage accuracy trumps those of the PRMs. Harvey knows a lot more about what it takes to make great sound than I do!

The JH13 and JH16 Freqphase in-ear headphones advance the state of the art. They're highly recommended.

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Attack at Algeria Gas Plant Heralds New Risks for Energy Development

The siege by Islamic militants at a remote Sahara desert natural gas plant in Algeria this week signaled heightened dangers in the region for international oil companies, at a time when they have been expanding operations in Africa as one of the world's last energy frontiers. (See related story: "Pictures: Four New Offshore Drilling Frontiers.")

As BP, Norway's Statoil, Italy's Eni, and other companies evacuated personnel from Algeria, it was not immediately clear how widely the peril would spread in the wake of the hostage-taking at the sprawling In Amenas gas complex near the Libyan border.

Map by National Geographic

Algeria, the fourth-largest crude oil producer on the continent and a major exporter of natural gas and refined fuels, may not have been viewed as the most hospitable climate for foreign energy companies, but that was due to unfavorable financial terms, bureaucracy, and corruption. The energy facilities themselves appeared to be safe, with multiple layers of security provided both by the companies and by government forces, several experts said. (See related photos: "Oil States: Are They Stable? Why It Matters.")

"It is particularly striking not only because it hasn't happened before, but because it happened in Algeria, one of the stronger states in the region," says Hanan Amin-Salem, a senior manager at the industry consulting firm PFC Energy, who specializes in country risk. She noted that in the long civil war that gripped the country throughout the 1990s, there had never been an attack on Algeria's energy complex. But now, hazard has spread from weak surrounding states, as the assault on In Amenas was carried out in an apparent retaliation for a move by French forces against the Islamists who had taken over Timbuktu and other towns in neighboring Mali. (See related story: "Timbuktu Falls.")

"What you're really seeing is an intensification of the fundamental problem of weak states, and empowerment of heavily armed groups that are really well motivated and want to pursue a set of aims," said Amin-Salem. In PFC Energy's view, she says, risk has increased in Mauritania, Chad, and Niger—indeed, throughout Sahel, the belt that bisects North Africa, separating the Sahara in the north from the tropical forests further south.

On Thursday, the London-based corporate consulting firm Exclusive Analysis, which was recently acquired by the global consultancy IHS, sent an alert to clients warning that oil and gas facilities near the Libyan and Mauritanian borders and in Mauritania's Hodh Ech Chargui province were at "high risk" of attack by jihadis.

"A Hot Place to Drill"

The attack at In Amenas comes at a time of unprecedented growth for the oil industry in Africa. (See related gallery: "Pictures: The Year's Most Overlooked Energy Stories.") Forecasters expect that oil output throughout Africa will double by 2025, says Amy Myers Jaffe, executive director of the energy and sustainability program at the University of California, Davis, who has counted 20 rounds of bidding for new exploration at sites in Africa's six largest oil-producing states.

Oil and natural gas are a large part of the Algerian economy, accounting for 60 percent of government budget revenues, more than a third of GDP and more than 97 percent of its export earnings. But the nation's resources are seen as largely undeveloped, and Algeria has tried to attract new investment. Over the past year, the government has sought to reform the law to boost foreign companies' interests in their investments, although those efforts have foundered.

Technology has been one of the factors driving the opening up of Africa to deeper energy exploration. Offshore and deepwater drilling success in the Gulf of Mexico and Brazil led to prospecting now under way offshore in Ghana, Mozambique, and elsewhere. (See related story: "New Oil—And a Huge Challenge—for Ghana.") Jaffe says the Houston-based company Anadarko Petroleum has sought to transfer its success in "subsalt seismic" exploration technology, surveying reserves hidden beneath the hard salt layer at the bottom of the sea, to the equally challenging seismic exploration beneath the sands of the Sahara in Algeria, where it now has three oil and gas operations.

Africa also is seen as one of the few remaining oil-rich regions of the world where foreign oil companies can obtain production-sharing agreements with governments, contracts that allow them a share of the revenue from the barrels they produce, instead of more limited service contracts for work performed.

"You now have the technology to tap the resources more effectively, and the fiscal terms are going to be more attractive than elsewhere—you put these things together and it's been a hot place to drill," says Jaffe, who doesn't see the energy industry's interest in Africa waning, despite the increased terrorism risk. "What I think will happen in some of these countries is that the companies are going to reveal new securities systems and procedures they have to keep workers safe," she says. "I don't think they will abandon these countries."

This story is part of a special series that explores energy issues. For more, visit The Great Energy Challenge.

Read More..