The suspect in Friday's shootings was described as James Holmes, a 24-year-old former medical student. He had attended the University of Colorado School of Medicine in Denver until last month, a school spokeswoman said, adding that she didn't know why he withdrew from the school, the AP reported.
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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