The Baltimore Police commissioner shut down police training indefinitely after a University of Maryland police officer was shot in the head during an exercise at a closed psychiatric hospital.

Baltimore Police Commissioner Anthony W. Batts told the Baltimore Sun the shooting was unacceptable and suspended all academy operations pending a safety review.

"We're going to take the time to dig to make this better so we don't have this happen again," Batts said.

Police declined to say why officers were using live ammunition or identify the training supervisor of the exercise, which took place at the Rosewood Center in Owings Mills.