An American airstrike that Afghan officials say killed 11 members of Afghanistan's elite counter-narcotics police force is to be investigated by the U.S. military.
U.S. aircraft and remotely piloted drones still carry out strikes in Afghanistan, targeting Taliban and other militants even after most foreign forces withdrew at the end of last year.
If proven, the incident would be one of the deadliest recent instances of "friendly fire," after at least eight Afghan soldiers were killed by a U.S. airstrike in July in Logar province.
Afghan officials initially said last week's airstrike took place in the southern province of Helmand, but later reports showed the elite police team was operating in the neighboring province of Kandahar.
"We feel it is prudent to investigate the airstrike our forces conducted in Kandahar," U.S. military spokesman Brigadier General Wilson Shoffner said in a statement on Tuesday.
Four counter-narcotics police were also wounded in the incident and one was still missing, according to an interior ministry report.
The U.S. military said an American officer now serving in Afghanistan would lead the investigation.