AURORA, Colo. (AP) - A gunman in a gas mask barged into a crowded Denver-area theater during a midnight showing of the Batman movie on Friday, 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." The suspect was taken into custody and identified by federal law enforcement officials as 24-year-old James Holmes. The officials spoke on condition of anonymity to discuss an ongoing investigation.  Authorities did not release a motive. The FBI said there was no indication that the shooting is tied to any terrorist groups.

Holmes had an assault rifle, a shotgun and two pistols, a federal law enforcement official said, speaking on the condition of anonymity to discuss the ongoing investigation.

FBI agents and police used a hook and ladder fire truck to reach Holmes' apartment in suburban Denver, Aurora police Chief Dan Oates said. They put a camera at the end of 12-foot pole inside the apartment, and discovered that the unit was booby trapped.  Authorities evacuated five buildings as they determine how to disarm flammable and explosive material.

SOURCE: AP