The apartment of James Holmes, 24-year-old suspected of killing 12 people in Colorado, is so extensively booby-trapped with explosive devices that police cannot safely defuse them. The solution: A robot. Police plan to send a robot into to detonate the devices sometime on Friday night, Reuters reports. The apartment building--as well as nearby buildings--have already been evacuated to prep for the blast, which is expected to be small in size. Holmes was arrested Friday for allegedly opening fire on an audience attending a midnight screening of The Dark Knight Rises in Aurora, Colo., killing 12 and injuring over 50 others.