Police say 71 people were shot in a suburban Denver movie theater early Friday during midnight shows of the new Batman movie. Twelve people were killed, ten of them at the theater.
Another 59 adults and children were wounded.
Aurora Police Chief Dan Oates says there were four showings of the movie at the time and all were sold out. He did not know how many people that amounts to.
Oates says investigators are confident the gunman acted alone.
Police arrested 24-year-old James Holmes, whose apartment four miles away was booby trapped.
Oates says Holmes wore body armor, used an assault rifle, a shotgun and a Glock handgun.
He says Holmes' car was parked in back of the theater.
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Oates was the police chief in Ann Arbor from 2001 to 2005.
Aurora is on Denver's east side and is Colorado's third-largest city with 327,000 residents. It is home to a large Defense Department satellite intelligence operation at Buckley Air Force Base, as well as The Children's Hospital, the University of Colorado Hospital and a future Veterans Affairs hospital.