The suspect apprehended in the mass shooting at a suburban Denver movie theater has been identified as James Holmes, 24, law enforcement sources told CBS News correspondent Bob Orr.

Twelve people died in the shooting at a showing of the new Batman film “The Dark Knight Rises” in Aurora, Colo., early Friday morning. A law enforcement source told Orr the shooting appears to have been carried out by a lone gunman.

There was also no immediate word of any motive. Federal law enforcement officials are being briefed on the attack, but at this point there is no indication it is terrorism-related, CBS News senior correspondent John Miller reports.

A law enforcement source told Orr that Holmes’ residence was “booby-trapped,” and that police saw what looked like “buckets of extra ammunition” and some kind of chemical inside his home.

The suspect spoke of “possible explosives in his residence. We are dealing with that potential threat,” Aurora Police Chief Dan Oates told reporters at a news conference.

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 theater and had secured those areas.

Read more at CBS News