The cause of Thursday’s crash is still being investigated, but a coalition statement said there was no enemy activity in the area when it happened.
A senior U.S. defense official said all six reported killed were U.S. Marines and there was no indication that the helicopter had been hit by enemy fire. The defense official spoke on condition of anonymity because the U.S. command in Afghanistan had not yet publicly released details, including the nationalities of the dead.
Taliban spokesman Qari Yousef claimed insurgents shot down the helicopter, a Chinook, in Musa Qala district of Helmand province, killing all on board. The Taliban frequently exaggerate the number of people they claim to have killed.
• Corbet reported from Paris. Associated Press writers Angela Charlton, Jamey Keaten and Samantha Bordes in Paris, and Robert Burns in Washington contributed to this report.