GRAND FORKS, N.D. (AP) — Grand Forks police say the death of a patient at a psychiatric hospital might have been caused by another patient.

Officers and paramedics responded to Red River Behavioral Health System on Saturday. Authorities say a preliminary investigation indicated the patient who died had been injured during an altercation with another patient.

Police are continuing to investigate what happened. They have released no other details, including the names of the patients.