Aurora 'Dark Knight' Shooting Suspect Identified The young man who is in custody after allegedly gunning down 12 people in a mass shooting spree overnight in Aurora, Colorado has been identified as local resident James Holmes, according to federal authorities. Law enforcement officials and witnesses told ABC News Holmes, 24, wore what appeared to be a bullet-proof vest and riot-type mask as he opened fire in a movie theater with three weapons at a midnight showing of "The Dark Knight Rises." In addition to the 12 deaths, at least 50 people were injured, according to police. A San Diego woman who identified herself as James Holmes' mother told ABC News she had awoken unaware of the shooting and had not yet been contacted by authorities. She immediately expressed concern that her son may have been involved. "You have the right person," she said, apparently speaking on gut instinct. I need to call the police... I need to fly out to Colorado. Local news reports showed aerial video of police cautiously searching Holmes' apartment, some five miles from the Century Aurora 16 theater, as the suspect reportedly told police he had explosives inside. Witnesses said that the man appeared at the front of the theater about 20 minutes into the movie with a rifle, handgun and gas mask. He then threw a canister that released some kind of gas, after which a hissing sound ensued, and he then opened fire on the crowd packed into the early-morning screening of the film. "We were maybe 20 or 30 minutes into the movie and all you hear, first you smell smoke, everybody thought it was fireworks or something like that, and then you just see people dropping and the gunshots are constant," witness Christ Jones told ABC's Denver affiliate KMGH. I heard at least 20 to 30 rounds within that minute or two. A man who talked to a couple who was inside the theater told ABC News, "They got up and they started to run through the emergency exit, and that when she turned around, she said all she saw was the guy slowly making his way up the stairs and just firing at people, just picking random people." "The gunshot continued to go on and on and then after we didn't hear anything," the couple told the man. We finally got up and there was people bleeding, there was people obviously may have been actually dead or anything, and we just ran up out of there, there was chaos everywhere. The FBI said approximately 100 of its agents are on the scene assisting with the ongoing investigation. ABC News' Clayton Sandell and Kevin Dolack contributed to this report.