Illinois July 4th Shooter Left Gun Near Scene of Crime: Prosecutors

Robert Crimo III, the suspect in the mass shooting that took place at a Fourth of July parade route in the wealthy Chicago suburb of Highland Park, Ill., in a still image obtained from a social media video. Robert Crimo/via Reuters

The man who opened fire on a parade in Illinois on July 4 left the gun he used near the scene of the crime, according to prosecutors.

Robert Crimo III, 21, was captured on surveillance video walking in an alley toward the back of a store in Highland Park just before the shooting, prosecutors said in a court document. A witness spotted a person on top of the building with a gun and saw muzzle flashes soon after as the person began shooting.