A British hostage who died in Afghanistan on Friday during a rescue mission may have been accidentally killed by coalition forces trying to save her, Prime Minister David Cameron said on Monday. Linda Norgrove, 36, who worked for a U.S. aid group, had been abducted on September 26 along with three Afghan co-workers when they visited a project in a remote part of Kunar province. Cameron said a review of the rescue attempt had brought new information about the circumstances surrounding Norgrove's death. "That evidence, and subsequent interviews with the personnel involved suggests that Linda could have died as a result of a grenade detonated by the task force during the assault," Cameron said in a news conference. He said he took full responsibility for authorising the operation to rescue the aid worker. A Foreign Office source at the weekend said U.S. forces conducted the rescue attempt and that no British troops were involved. Media said that American special forces had mounted the operation.