AURORA, Colo. (AP) -- Colorado firefighters say they're monitoring an apartment building for gases in an effort to determine what chemicals one of its residents might have used to booby trap the place, in case they go off.
The man, 24-year-old James Holmes, is the suspect in a mass shooting early Friday at a movie theater about four miles away.
Aurora Fire Chief Chris Henderson says "it's a pretty extensive booby trap" and investigators aren't sure what it's attached to. He says there are trip wires and three containers and they don't know what's inside.
Henderson says if there is a detonation that causes a fire, firefighters will fight it from the outside of the building.
Surrounding buildings have been evacuated.
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