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FBI: Holmes' booby trap included improvised napalm

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Defense attorney Daniel King and his team leave district court during a recess in a preliminary hearing for James Holmes at the courthouse in Centennial, Colo., on Monday, Jan. 7, 2013. Investigators say Holmes opened fire during the midnight showing of the latest Batman movie on July 20, killing 12 people and wounding dozens.(AP Photo/Ed Andrieski)

CENTENNIAL, Colo. (AP) — An elaborate booby trap system allegedly set up to pull police away from the Colorado theater shooting included improvised napalm and thermite, which burns so hot that water can't put out the blaze.

FBI bomb technician Garret Gumbinner described the system Tuesday at a hearing in which prosecutors laid out their case against suspected gunman James Holmes.

He said three different ignition systems were found in Holmes' apartment. There was a thermos full of glycerin leaning over a skillet full of another chemical. Flames and sparks are created when they mix. A trip wire linked the thermos to the door.

Police say Holmes hoped a boom box on a timer would lure someone to the apartment.

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