Allen remained on the scene until two other officers arrived in response to the distress call. He initially fled in his car but quickly returned, attempting to shoot the officers as he drove past. Several more squad cars arrived in pursuit of Allen, still firing from the windows with the service revolver and a now unjammed carbine. After two collisions with police cruisers and one with a CTA bus, Allen was finally stopped when Officer Lawrence Rapien intentionally steered his cruiser head on into Allen's car.