BALTIMORE (AP) - The Baltimore police commissioner has suspended some training academy staff after a campus police trainee was shot in the head by an instructor.

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Police spokesman Anthony Guglielmi says authorities are continuing to investigate Tuesday's shooting, which occurred during a training exercise in Baltimore County. All training academy operations have also been suspended.

Guglielmi says the investigation is focusing on how the instructor came to discharge live ammunition, though one theory is that he picked up the wrong gun. He says police officials are also trying to figure out who authorized the training session because the location where the shooting occurred is not one of the normal sites used by the department.

The trainee, training for the University of Maryland, Baltimore campus police, remained in critical condition Wednesday.