Prime minister: Hostage may have been killed by U.S. grenade

A British aid worker who died during an operation to rescue her from kidnappers in Afghanistan may have been killed by a grenade thrown by American forces trying to free her, British Prime Minister David Cameron said Monday.

Gen. David Petraeus, the top U.S. commander in Afghanistan, will launch an investigation into the failed attempt to rescue Linda Norgrove, 36, Cameron said.

NATO and British officials had said earlier she was killed by her captors, who detonated an explosive.

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