Aurora, Colo. (AP) - 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. No word on a motive.
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.
"Witnesses tell us he released some sort of canister. They heard a hissing sound and some gas emerged and the gunman opened fire," Aurora Police Chief Dan Oates said at a news conference.
FBI spokesman Jason Pack said there's no indication in the investigation so far of any connection to terrorism.
Police, ambulances and emergency crews swarmed on the scene after frantic calls started flooding the 911 switchboard, officials said.
Officers came running in and telling people to leave the theater, Salina Jordan told the Denver Post. She said some police were carrying and dragging bodies.
"A gas mask, rifle, handgun at least one additional weapon (were) found inside," he said.
The suspect spoke of "possible explosives in his residence. We are dealing with that potential threat," Oates said
Police were at the Denver-area apartment and had evacuated other residents of the building. Oates did not say whether any explosives had been found.
He said police also checked for explosives in the parking lot and at the Century 16 theater and secured those areas.
President Barack Obama said he was saddened by the "horrific and tragic shooting," pledging that his administration was "committed to bringing whoever was responsible to justice, ensuring the safety of our people, and caring for those who have been wounded."