FORT TOTTEN, N.D. (AP) — Federal authorities say a tribal police officer was involved in a shooting on an Indian reservation in North Dakota. FBI special agent Cindy Burnham on Wednesday told WDAZ-TV (http://bit.ly/1BolEUg ) that the shooting took place overnight on the Spirit Lake Indian Reservation. She says the incident remains under investigation. The station reports it is still unknown whether someone was injured or killed in the shooting.