UPDATE 16-Gunman kills 12 in rampage at 'Batman' premiere in Colorado
* Suspect, a 24-year-old medical student, in custody
* Officials say suspect booby-trapped his apartment
* Police increase presence at New York screenings
* U.S. military personnel among the victims
By Keith Coffman and Stephanie Simon and Mary Slosson
AURORA, Colo., July 20 (Reuters) - A gunman wearing a full suit of tactical body armor, a helmet and a gas mask opened fire at a packed midnight showing of the new "Batman" film in a Denver suburb on Friday, killing 12 people after setting off two smoke bombs in the dark theater.
Armed with an assault rifle, a shotgun and a pistol, the black-clad gunman wounded 58 others in the shooting rampage at a showing of "The Dark Knight Rises" at a mall in Aurora, turning the movie screening into a chaotic scene of dead or bleeding victims, horrified screams and pleas for help, witnesses said.
Police said 30 people remained hospitalized on Friday evening, 11 of them in critical condition.
Officers who arrived on scene within 90 seconds of the first emergency calls quickly took suspect James Eagan Holmes, 24, into custody in a parking lot behind the cinema, where he surrendered without a fight, Aurora Police Chief Dan Oates said.
Holmes, a graduate student who authorities said had his hair dyed red and called himself "the Joker" in a reference to Batman's comic-book nemesis, was due to make an initial court appearance on Monday.
Police declined to say what, if anything, Holmes said to them following his arrest. During an emotional press conference, Oates would not comment on possible motives for the massacre that stunned the community and the nation.
Authorities were unable to enter Holmes' apartment on Friday, saying he had booby-trapped it with what appeared to be sophisticated explosives. Police evacuated five nearby buildings and created a perimeter of several blocks and said they planned to detonate the suspected explosives with a robot on Saturday.
Meanwhile, police used dogs to search three buildings in a research complex at Anschutz Medical Campus at the University of Colorado at Denver where Holmes had worked. A university spokeswoman said nothing suspicious was found.
Witnesses at the movie theater told of a horrific scene, with dazed victims bleeding from bullet wounds, spitting up blood and crying for help. Among those taken to hospitals as a precaution was a baby boy just a few months old.
"I slipped on some blood and landed on a lady. I shook her and said, 'We need to go; get up,' and there was no response, so I presumed she was dead," said Tanner Coon, 17.
FUZZY PORTRAIT OF SUSPECT
Confusion reigned as shooting broke out during an action scene in the summer blockbuster. The suspect may have blended in with other moviegoers who wore costumes as heroes and villains, and some witnesses said they believed at first that his appearance was a theatrical enhancement to the film.
"It was just straight chaos," said Jennifer Seeger, 25. "Everybody was starting to scream and run at that point. He went straight from here to here with a gun in my face at that point. That rifle was in my face and I honestly didn't know what to think."
The shooting evoked memories of the 1999 massacre at Columbine High School in Littleton, 17 miles (27 km) from Aurora, where two students opened fire and killed 12 students and a teacher.
It also resonated in the U.S. presidential race. Both President Barack Obama and his Republican rival, Mitt Romney, toned down their campaigns, pulled their ads from Colorado and dedicated their scheduled events to the victims.
"My daughters go to the movies," Obama told supporters at a campaign event in Fort Myers, Florida. "What if Malia and Sasha had been at the theater as so many kids do each day?"
The gunman was armed with an AR-15 assault rifle, a 12-gauge shotgun and a Glock .40-caliber handgun, Oates said. Police found an additional Glock .40-caliber handgun in his car, parked just outside the theater's rear emergency exit, Oates said.
He was dressed entirely in black with a gas mask, ballistic helmet, tactical ballistic vest, throat guard, leggings and crotch guard, Oates said, adding that Holmes had purchased the weapons legally at three area gun stores in the last 60 days and had bought 6,000 rounds of ammunition.
A law enforcement official who asked to remain anonymous said the suspect had purchased a ticket, entered the theater and propped open the emergency exit while he slipped out to "gear up" and return armed.
The portrait of Holmes that emerged in the hours following the shooting remained fuzzy, with only a speeding ticket on his record and nothing to suggest he was capable of an outburst of gun violence.
He grew up in a middle-class San Diego neighborhood and earned a degree in neuroscience from the University of California at Riverside before seeking his graduate degree from the University of Colorado.
People who knew him described him as kind toward children but said he had trouble finding work.
Holmes was described as bright but was in the process of dropping out of his graduate program at the time of the shooting, according to the university.
Billy Kromka, a pre-med student at the University of Colorado at Boulder who served as a research assistant alongside Holmes for several months last year, said he was astonished at the news.
"He basically was socially awkward but not to the degree that would warrant suspicion of mass murder or any atrocity of this magnitude," Kromka, 19, said. "I did not see any behavior he exhibited that indicated he would be capable of an atrocity of a magnitude like this."
Kromka said Holmes never talked politics or became animated about any particular subject, but appeared to be influenced by movies and the media and played online role-playing video games.
But New York Police Commissioner Ray Kelly said he "clearly looks like a deranged individual."
"He had his hair painted red. He said he was The Joker, obviously the enemy of Batman," Kelly told reporters, referring to a character in the Batman comic and cinematic universe known for committing acts of random, chaotic violence.
'GONE NOT FORGOTTEN'
Holmes' family issued a statement of sympathy for the victims, saying, "Our heart goes out" to their loved ones, while they also asked for privacy from the media while they "process this information."
Meanwhile, as darkness fell across Denver, a row of prayer candles and a dozen or so bouquets of flowers were clustered under a single hand-written sign that read: "7/20 gone not forgotten."
The theater remained cordoned off with police vehicles lining the perimeter, and Oates said officers would be on hand for future showings of "The Dark Knight Rises" in the city.
In New York, police pledged to deploy officers at all 40 theaters where the film was playing, partly as a precaution against "copycats." Los Angeles police said they would increase patrols at screenings of the film.
The Paris movie premiere was cancelled on Friday, event organizers said. Director Christopher Nolan called the shooting an "unbearably savage" event for which he expressed "profound sorrow" to the victims and their families.
Time Warner-owned Warner Bros, the studio behind the film, faced the prospect of seeing the blockbuster sink at the box offices even as the film got off to a strong start across the United States and Canada.
The film, with a budget of $250 million, opened on 4,404 screens, the second-widest release ever behind "Twilight: Eclipse," and industry analysts had said it stood a good chance of matching or beating the opening weekend box office record of $207 million set by Disney's "Avengers" in May.