Yellow markers sit next to evidence, including a gas mask, as police investigate the scene outside the Century 16 movie theater east of the Aurora Mall in Aurora, Colo. on Friday, July 20, 2012. 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 in one of the deadliest mass shootings in recent U.S. history. (AP Photo/David Zalubowski)

Associated Press
Yellow markers sit next to evidence, including a gas mask, as police investigate the scene outside the Century 16 movie theater east of the Aurora Mall in Aurora, Colo. on Friday, July 20, 2012. 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 in one of the deadliest mass shootings in recent U.S. history. (AP Photo/David Zalubowski)
Yellow markers sit next to evidence, including a gas mask, as police investigate the scene outside the Century 16 movie theater east of the Aurora Mall in Aurora, Colo. on Friday, July 20, 2012. 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 in one of the deadliest mass shootings in recent U.S. history. (AP Photo/David Zalubowski)
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