A gunman wearing a gas mask set off an unknown gas and fired into a crowded movie theater in Aurora, Colo. at a midnight opening of the Batman movie "The Dark Knight Rises," killing 12 people and ... more 
A gunman wearing a gas mask set off an unknown gas and fired into a crowded movie theater in Aurora, Colo. at a midnight opening of the Batman movie "The Dark Knight Rises," killing 12 people and injuring at least 50 others, authorities said. (July 20) less 
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Fri, Jul 20, 2012 9:45 AM EDT