DENVER (AP) — The Colorado movie theater complex that was the scene of a gunman's massacre this month didn't have any uniformed security guards on duty the night of the shooting, even though other theaters operated by the same company did provide such protection for the busy premiere of the Batman film "The Dark Knight Rises." It's impossible to know whether guards — often off-duty police officers — at the Aurora Century 16 would have spotted the suspected gunman, James Holmes, and thwarted the attack that left 12 moviegoers dead and dozens wounded on July 20. Officers hired as guards are generally armed and usually spend their time roaming the complex, checking bags or dealing with minor disputes.