WANBLEE, S.D. (AP) — The FBI is investigating a fatal crash involving an Oglala Sioux tribal police officer on the reservation.

Oglala officials say the officer was responding to a 911 call about gunfire when he crashed into a van on Highway 44 near Wanblee Oct. 25, killing the driver and a passenger.

Officials have not named the officer or the victims. But, relatives say 7-year-old Emily Rain White and her aunt, 41-year-old Raquel Yankton-Reinhart, were killed. Three other passengers received injuries ranging from minor to severe.

FBI spokesman Kevin Smith tells the Rapid City Journal tribal police usually investigate crashes on the reservation. But since an officer was involved, the FBI is handling the case and will determine whether any crime was committed. The state Highway Patrol will investigate what caused it.