Shots are heard at 4:35 p.m. near the outdoor motor pool. Lopez had been assigned to the 13th Sustainment Command (Expeditionary). Lopez ran into the medical building and fires shots from a .45 semi-automatic pistol at individuals in the 1st Medical Brigade. Some people try to flee by jumping over a seven-foot-high barbed wire fence.
He leaves that building, gets into a vehicle and continues firing. He goes to another building at the post, enters and opens fire.