Wearing a gas mask, Holmes allegedly walked into a midnight showing of the Batman movie, unleashed a gas canister and then opened fire, making it one of the deadliest mass shootings in recent U.S. history, the news service said.
As the gas started to spread, some patrons thought it was a stunt that was part of the movie. Then they saw a silhouette of a person in the smoke near the screen, first pointing a gun at the crowd and then shooting, the AP reported.
Authorities did not release a motive, and the FBI said there was no indication that the shooting was tied to a terrorist group.
Holmes reportedly had an assault rifle, a shotgun and two pistols, a federal law enforcement official said, speaking on the condition of anonymity, the AP reported.
The Anxiety and Depression Association of America has more on anxiety in children and teens.
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