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Firefighter work in front of an apartment where the suspect in a theatre shooting lived in Aurora, Colo., on Friday, July 20, 2012. As many as 12 people were killed and 50 injured at a shooting at the Century 16 movie theatre on Friday. The suspect is identified as 24-year-old James Holmes. (AP Photo/Ed Andrieski)

Firefighter work in front of an apartment where the suspect in a theatre shooting lived in Aurora, Colo., on Friday, July 20, 2012. As many as 12 people were killed and 50 injured at a shooting at the Century 16 movie theatre on Friday. The suspect is identified as 24-year-old James Holmes. (AP Photo/Ed Andrieski)

Colorado suspect's booby-trapped home

In Aurora, investigators spent hours July 21 removing explosive

materials from inside Holmes' apartment, rigged with jars of liquids, explosives and chemicals that were booby trapped to kill "whoever entered it," a day after police said he

opened fire and set off gas canisters in a theater minutes into a

premiere of the "The Dark Knight Rises." The massacre left 12 people dead and 58 injured.