Police to enter Colorado shooting suspect's apartment

On Saturday, officials planned to enter the supposedly booby-trapped apartment of James Holmes, the man who allegedly gunned down 12 people and injured scores more at a Friday (July 20) midnight showing of the latest Batman installment, "The Dark Knight Rises" in Aurora, Colorado.

Bomb experts will enter the third-floor apartment where the 24-year-old Holmes allegedly stockpiled ammunition and left a trip-wired explosive of some sort designed to injure and kill police officers.

"It's a pretty extensive booby trap. We're not sure what it's attached to," deputy fire chief Chris Henderson tells the Associated Press. "There are trip wires. There are three containers and we don't know what's inside."

PHOTOS: Tragedy in Colorado

Authorities may resort to a controlled detonation. The building and surrounding area have already been evacuated to prevent any potential harm to neighbors.

Pictures taken inside Holmes' apartment show jars full of ammunition and unidentified liquids.

"I personally have never seen anything like what the pictures show us is in there," says Henderson.

UPDATE: At 11:30 a.m. local time, police set off a controlled detonation in Holmes' apartment which could be heard at least a block away, reports the Los Angeles Times.