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.