Two Army Rangers who died Thursday during an intense night-time battle with the Islamic State in Afghanistan might have been killed by friendly fire, the Pentagon said on Friday.

Sgt. Joshua P. Rodgers, 22, of Bloomington, Ill., and Sgt. Cameron H. Thomas, 23, of Kettering, Ohio, were part of an assault on an ISIS-Khorasan compound in Nangarhar province that was aimed at killing the head of the terrorist group in the country.