James Holmes Update: Accused Colo. theater shooter's booby trap included improvise napalm, FBI says

(AP) CENTENNIAL, Colo. - An FBI bomb technician testified Tuesday that alleged Aurora, Colo., movie theater shooter James Holmes rigged an elaborate booby trap system intended to pull police away from the Colorado theater shooting, and that it included improvised napalm and thermite, which burns so hot that water can't put out the blaze.

Pictures: The Colorado massacre suspect

Garret Gumbinner described the system at a hearing in which prosecutors are laying out their case against 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.

So far the hearing has focused on the horror officers discovered at the theater just after midnight on July 21, 2012. The magnitude of the attack could be heard in the first 911 call to police, played Tuesday in court. It lasted 27 seconds and police say at least 30 shots could be heard.

The call came in 18 minutes into the showing of "The Dark Knight Rises."

Police also played a 911 call from a teenage cousin of 6-year-old Veronica Moser-Sullivan, the youngest person killed. A dispatcher tried to talk her through CPR but she sounded panicked and said she couldn't hear.

A bearded and disheveled Holmes stared straight ahead as the calls were played and didn't show any emotion.

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