An EMS technician was shot while on the job on Saturday.
While inside Medic Unit 18, the technician was confronted by a man who robbed and shot him in the arm, police said.
The technician was transported to Sinai Grace Hospital where is he listed in temporary serious condition.
The shooter is described as a black man, 6 feet tall with a medium complexion. He was last seen wearing a ski mask, dark-colored jeans and a gray-hooded sweatshirt.
Police are investigating how the shooter managed to get inside the secured facility.
An investigation is under way.