AURORA, Colo. (AP) - A Denver suburb rocked by a deadly theater massacre is trying to cope with the shock and sadness today as police search for a motive and a safe way to enter the suspect's apparently booby-trapped apartment.
Late Friday night, police grimly went door to door notifying families of the 12 victims killed in the worst mass shooting in the U.S. in recent years. Another 58 people were injured either by gunfire or amid the chaos of people trying to flee the theater in Aurora, Colo.
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.
Police are moving cautiously as they prepare an attempt Saturday to enter the booby-trapped apartment of the suspect in the Aurora, Colo., theater massacre that killed 12 people and injured 58.
Firefighters are monitoring the apartment building for gases in an effort to determine what chemicals they say 24-year-old James Holmes might have used to booby-trap the place -- in case the materials go off.
Police evacuated the building and surrounding residences after arresting Holmes as the suspect in a mass shooting Friday at a midnight screening of "The Dark Knight Rises."
FBI agents and police discovered it was booby-trapped when they used a camera at the end of a 12-foot pole to look inside.
Photos of Holmes' apartment appeared to show trip wires, jars full of ammunition and liquid and other items unlike. Aurora's police chief says he's never seen anything like it.
Authorities say the four weapons recovered in a mass shooting at a movie theater were purchased by the suspect from retail gun stores in Colorado in the last two months.
Aurora Police Chief Dan Oates said nearly 7,000 rounds and multiple magazines for those weapons also were purchased online. He said all of the weapons and ammunition were possessed legally.
A federal law enforcement officer said suspect James Holmes bought a Glock pistol on May 22 at Gander Mountain in Aurora. The official spoke on condition of anonymity because the probe into the shootings is ongoing.
Gander Mountain said it is "fully cooperating" with the investigation.
A Missouri online seller of tactical police gear told the St. Louis Post-Dispatch that it sold more than $300 of equipment to Holmes on July 2.
(story continues below)
Hundreds of mourners gathered at vigils for the victims of the shootings at a suburban Denver theater showing the latest Batman movie.
At the Queen of Peace Roman Catholic church in Aurora, a few miles from the shooting, more than 1,000 mourners gathered Friday evening for a memorial Mass. Newly installed Denver Archbishop Samuel Aquila told mourners dabbing their eyes, "Blessed are those who mourn, for they will be comforted."
He said, "The heart of our Father is stronger than the bullets that killed 12 people."
Near the entrance to the theater's parking lot, a makeshift memorial of 12 candles sat in a row near piles of flowers. Up the hill, about 20 pastors led an emotional vigil for about 350 people, some hugging and crying.
Copyright 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.
A 4-year-old Pasco County boy is dead. According to family members, doctors suspect he contracted bacterial meningitis, He started showing symptoms Saturday night.