(Newsroom America) -- At least 12 people have been killed and 38 injured after a heavily armed gunman opened fire during an early Friday morning screening of the new Batman movie at an Aurora, Colorado, theater.
Many of the injured are reported to be in a critical condition. Ten people reportedly died in the theater and two more died in hospital.
A police spokesman Frank Fania told CNN a man believed to be the shooter, now identified as James Holmes, 24, was arrested in a rear parking lot of the theater.
"He did not resist. He did not put up a fight," Fania said.
ABC News quoted witnesses as saying the gunman crashed into the Century 16 Movie Theaters, nine miles outside Denver, from an emergency exit door at the front of the auditorium.
Police told ABC News he set off a smoke bomb and then opened fire using multiple firearms. One witness told CNN the shooting started during a scene in the movie in which there was lots of gunfire, adding to the confusion.
"The suspect throws tear gas in the air, and as the tear gas appears he started shooting," said Lamar Lane, another witness who was in the theater with his brother.
"It was very hard to breathe. I told my brother to take cover. It took awhile. I started seeing flashes and screaming, I just saw blood and people yelling and a quick glimpse of the guy who had a gas mask on. I was pushed out. There was chaos, we started running," he told ABC news.
Law enforcement officials have been reported as saying an AK type assault rifle, a shotgun and two handguns have so far been recovered from the scene. The gunman was also reportedly wearing a bullet proof vest and was carrying a gas mask.
Reports said Holmes told authorities that there were explosives in his North Aurora residence, with the apartment complex now under lockdown. Investigators confirmed that explosives were found.
FBI spokesman Jason Pack was quoted as saying it did not appear the incident was related to terrorism. Reports suggest he acted alone, but investigations were continuing.
The FBI said approximately 100 of its agents are at the scene assisting with the investigation.
The PG 13 movie "The Dark Knight Rises" had been sold out with the first screenings last night.
President Obama issued a statement saying he was shocked and saddened by the horrific and tragic shooting in Colorado.
"Federal and local law enforcement are still responding, and my administration will do everything that we can to support the people of Aurora in this extraordinarily difficult time. We are committed to bringing whoever was responsible to justice, ensuring the safety of our people, and caring for those who have been wounded."