UPDATE: Movie massacre: Shock, sadness, a search for clues

AURORA, Colo. (AP) - Police continue to take a cautious approach to the Colorado shooting suspect's apartment.
   
FBI agents and police discovered it was booby-trapped with trip wires when they used a camera on a pole to look inside. Firefighters are monitoring the building for gases in an effort to determine what chemicals 24-year-old James Holmes might have used in his traps. Photos apartment appear to show jars full of ammunition and liquid.
   
Police plan to try to enter sometime today.
   
Last night, police went door to door  notifying families of the victims. Twelve people died and 58 were injured in the attack. Eleven of the wounded are listed in critical condition.
   
Mourners are remembering the victims as names begin to emerge. A memorial Mass was held at the Queen of Peace Roman Catholic church in Aurora last night and a makeshift memorial of candles and flowers has sprung up near the theater.
   
The suspect's stellar academic record, apparent shy demeanor and lack of a criminal background is making the attack even more difficult to fathom.
   
The new Batman movie, the last in the trilogy starring Christian Bale, opened worldwide yesterday with midnight showings in the U.S.