AURORA, Colo. - Police probing a Colorado shooting rampage prepared on Saturday to send in a robot to detonate what they called a sophisticated booby-trap in the apartment of a man accused of killing 12 people at a screening of the new "Batman" film.

James Eagan Holmes, 24, is accused of storming into a theater in a suburban Denver multiplex just after midnight on Friday clad head-to-toe in black body armor and a gas mask and tossing smoke bombs into the audience before shooting seemingly at random.

The graduate student, who authorities said had dyed his hair red and called himself "The Joker" in a reference to Batman's comic-book nemesis, was taken into custody outside the theater minutes after the attack.

Police later found a set of explosives at his home following his arrest after the shooting at a showing of "The Dark Knight Rises" in Aurora and have been unable to enter.

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