Today's tragic attack in an Aurora, Colorado movie theater marks one of the worst mass shootings in the nation's history. 12 people are dead, 58 others wounded and the violence left everyone asking what could motivate someone to go on a bloody rampage.
The suspect, 24-year-old James Holmes, opened fire on innocent moviegoers, using multiple guns, during a screening of the new Batman movie. The details are horrifying. A source tells CNN Holmes bought a ticket, exited the theater propping an emergency door open, dressed in head-to-toe tactical gear, and then went back into the theater armed with tear gas and deadly weapons. His apartment was prepared for a police search with booby traps and trip wires.
More details about him are emerging, along with new eyewitness accounts and heartbreaking stories of loss. Anderson is live from Aurora for the 8 and 10 p.m. broadcasts tonight. Tune in and join the conversation on the live blog.
Anderson Cooper goes beyond the headlines to tell stories from many points of view, so you can make up your own mind about the news. Tune in weeknights at 8 and 10 ET on CNN.
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