ALGIERS, Algeria — Algerian forces launched a military assault Thursday at a natural gas plant in the Sahara Desert, trying to free dozens of foreign hostages held by militants who have ties to Mali's rebel Islamists, diplomats and an Algerian security official said.
Yet information on the Algerian operation varied wildly and the conflicting reports that emerged from the remote area were impossible to verify independently.
Jean-Christophe Gray, a spokesman for British Prime Minister David Cameron, said Britain was not informed in advance of the raid but described the situation as "very grave and serious." French President Francois Hollande called it a "dramatic" situation involving dozens of hostages.
Islamists with the Masked Brigade, who have been speaking through a Mauritanian news outlet, said the Algerians opened fire Thursday as the militants tried to leave the vast Ain Amenas energy complex with their hostages. They claimed that 35 hostages and 15 militants died but seven hostages survived when Algerian helicopters strafed their convoy.
Algeria's official news service, meanwhile, claimed that 600 local workers were freed in the raid and half of the foreigners being held were rescued. Many of those locals were reportedly released on Wednesday, however, by the militants themselves.
One hostage was confirmed to be safe: Ireland said an Irish hostage at the plant was free and had made contact with his family.
An unarmed American surveillance drone soared overhead as the Algerian forces closed in, U.S. officials said. President Barack Obama's government offered military assistance Wednesday to help rescue the hostages — whose numbers varied wildly from dozens to hundreds — but the Algerian government refused, a U.S. official said in Washington. He spoke on condition of anonymity because he was not authorized to speak publicly about the offer.
News of the operation caused oil prices to rise $1.08 to $95.32 on the New York Mercantile Exchange and prompted energy companies like BP PLC and Spain's Compania Espanola de Petroleos SA to try to relocate energy workers at other Algerian plants.
Algerian forces who had ringed the Ain Amenas complex in a tense standoff had vowed not to negotiate with the kidnappers, who reportedly were seeking safe passage. Security experts said the end of the two-day standoff was in keeping with the North African country's tough approach to terrorism.
The kidnapping is one of the largest ever attempted by a militant group in North Africa. The militants phoned a Mauritanian news outlet to demand that France end its intervention in neighboring Mali to ensure the safety of the hostages in the isolated plant, located 800 miles (1,300 kilometers) south of the capital of Algiers.
Phone contacts with the militants were severed as government forces closed in, according to the Mauritanian news service, which often carries reports from al-Qaida-linked extremist groups in North Africa.
Both sides agreed only that the raid led to more bloodshed a day after the militants tried to hijack a busload of workers, were repulsed, then moved onto the sprawling desert plant and took hostages.
A 58-year-old Norwegian engineer who made it to the safety of a nearby Algerian military camp told his wife how militants attacked a bus Wednesday before being fended off by a military escort.
"Bullets were flying over their heads as they hid on the floor of the bus," Vigdis Sletten told The Associated Press in a phone interview from her home in Bokn, on Norway's west coast.
Her husband and the other bus passengers climbed out of a window and were transported to a nearby military camp, she said.
"He is among the lucky ones, and he has confirmed he is not injured," she said, declining to give his name for security reasons.
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