A 25-year-old unarmed man shot and killed by a Prince George’s County police officer early Monday repeatedly failed to follow an officer’s orders to keep his hands visible, according to an ongoing investigation by police.

This is the fourth shooting by a Prince George’s County police officer since the beginning of the month. Monday’s incident also marked the second fatal shooting in September. Questions submitted to the police about the total number of shootings, how many officers have been placed on administrative leave because of the shootings and other inquiries were not answered by deadline Tuesday.