(CBS/AP) AURORA, Colo. - The apartment of the suspect in a mass shooting at a Denver area movie theater was booby trapped, police said. Five surrounding buildings have been evacuated as a precaution.
Aurora Police Chief Dan Oates said bomb technicians were determining how to disarm flammable or explosive material in the third-floor apartment. He said police could be on site for some time.
Oates said pictures from inside the apartment were fairly disturbing and the devices looked to be sophisticated.
FBI agents and police used a hook and ladder fire truck and put a camera at the end of 12-foot pole inside the apartment where 24-year-old James Holmes lives.
The apartment was about four miles from the theater where at least 12 people were killed and 59 were wounded.
One federal official told CBS News that Holmes appeared to have been "under the radar." CBS News reports Holmes did not appear to have a criminal record in Colorado or in California's San Diego County, where he lived previously. Pentagon officials said there was no record of Holmes having served in any branch of the military.
The Associated Press reported that Holmes was a student at the University of Colorado's medical school but withdrew last month, according to the school.
The suspect barged into a crowded Denver-area theater during a midnight showing of the Batman movie, hurled a gas canister and then opened fire, killing 12 people and injuring at least 50 others in one of the deadliest mass shootings in recent U.S. history.
When the gas began to spread, some moviegoers thought it was a stunt that was part of the "The Dark Knight Rises," one of the most highly anticipated films of the summer. They saw a silhouette of a person in the smoke near the screen, first pointing a gun at the crowd and then shooting.
"There were bullet (casings) just falling on my head. They were burning my forehead," Jennifer Seeger said, adding that the gunman, dressed like a SWAT team member, fired steadily except when he stopped to reload.
"Every few seconds it was just: boom, boom, boom," she said. "He would reload and shoot and anyone who would try to leave would just get killed."
Police recovered four guns at the theater - one shotgun, two pistols and what is believed to be an assault rifle, a law enforcement source told CBS News correspondent Bob Orr. Authorities also recovered a gas mask.
A law enforcement source said the suspect also had a bullet proof vest, ballistic helmet and military SWAT clothing. Authorities were testing unidentified explosives in his vehicle, though their exact nature is unclear.
The nature of the attack suggests it was well planned. The suspect's vehicle was parked at the rear of the complex, near the emergency exit where he was reported to have entered from.
Oates said there was no evidence of any other attackers. 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.
(Copyright 2012 CBS News and the Associated Press.)
