A college student was injured after a police officer's gun accidentally fired inside a sandwich shop in Brooklyn Wednesday. The officer stopped at a Blimpie store in Flatbush on his way to work. While he was eating, his gun slipped off of his waistband and fired a shot, according to police. The bullet hit the ground, police said, fragments of the floor tile hit the 19-year-old student. She was treated and released from an area hospital.