"I have informed the Afghan government of the situation. ISAF [International Security Assistance Force] will do a very thorough investigation and, if appropriate, we will take action against the personnel involved," U.S. Marine Gen. Joseph F. Dunford, ISAF commander, said in a release.
The alleged misconduct occurred during an operation in Zabul province in southern Afghanistan. The investigation followed an internal report on the matter, ISAF said.
The ISAF didn't provide more information because it was an ongoing investigation.
"We take all allegations of misconduct by our personnel very seriously. ISAF will fully investigate this incident and keep the Afghan government informed," Dunford said.
No timeline has been set for completion of the investigation.