[Updated at 5:33 p.m. ET] Algerian forces are looking to negotiate the release of remaining foreign captives, Algerian state media reports, but are holding out the threat of further action.
"The special forces of the (Algerian army) are still seeking a peaceful settlement before neutralizing the terrorist group currently entrenched in the refinery, and free a group of hostages who are still detained," according to a report by Algerian state news agency APS.
[Updated at 3:58 p.m. ET] One Frenchman was killed and three others were saved in an operation to free hostages in Algeria, the press office of the Ministry of Foreign Affairs in Paris says.
[Updated at 1:55 p.m. ET] Twelve hostages have been killed since Algerian Special Forces launched a ground operation on Thursday to free captives held by militants at a gas field complex, APS, the official Algerian news agency, reported, citing a security source.
[Updated at 1:19 p.m. ET] A U.S. State Department spokeswoman says the U.S. will not negotiate a prisoner exchange with terrorists holding captives in Algeria. It was unclear how many, if any, Americans were being held hostage.
Gliese 581g may be the new Earth.
A team of astronomers from the University of California and the Carnegie Institute of Washington say they've found a planet like ours, 20 light years (120 trillion miles) from Earth, where the basic conditions for life are good.
"The chances for life on this planet are 100 percent," Steven Vogt, a UC professor of astronomy and astrophysics says. "I have almost no doubt about it."
The planet is three times the size of Earth, but the gravity is similar.
Dr. Elizabeth Cunningham, planetarium astronomer at the Royal Observatory in Greenwich, says the discovery is a huge deal.
"It could have liquid water on the surface," she said. "That's the first step to find life."