Aurora, Colorado (CNN) -- The suspect in last week...

Aurora, Colorado (CNN) -- The suspect in last week's deadly shooting rampage at a crowded

Colorado movie theater boobytrapped his apartment with more than 30 homemade grenades and 10 gallons of gasoline,a law enforcement official who viewed video from insidethe apartment told CNN Monday night.The sophisticated set up at the sparsely furnished Aurora home of James E. Holmes was meant to

harm, or possibly kill, anyone who entered -- and tested the skills of bomb squad members charged

with clearing it. "Imagine that fireball ... you would have anexplosion that would knock down the wall of

(nearby) apartments," the official said. "That flame would have consumed the entire third floor

(of the apartment complex)." Focusing on the victims, not the shooter

"By the time a fire truck would have arrived, they would have arrived to a building that would have

been completely consumed in flames." The grenades were wired to a control box in the kitchen, which bomb technicians disabled with the help of a remote- controlled robot that squirted water on it.

"It looked like spaghetti," according to the

official, who said it resembled setups that

are used in Iraq and Afghanistan, but

rarely in the United States.

The control box has been sent to Quantico,

Virginia, for forensic analysis at the FBI

laboratory, the official said.

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But the setup appears to have been

"rigged" so that it would have exploded,

according to the official. A "post-blast analysis" will determine if it would have

worked. The gasoline was divvied up into glass containers and gas cans in order to

"enhance the thermal effect of the explosion," the official said. Over the weekend, Aurora Police Chief Daniel

Oates told reporters there was "evidence of ... some calculation and deliberation" in the Friday

attack at the Century Aurora 16 multiplex. Holmes received deliveries over the past four

months at his home and work addresses, which begins to explain how he may have obtained

some of the materials used in the attack and those found at his apartment, Oates said.

The University of Colorado School of Medicine, where Holmes enrolled as a doctoral candidate in

its neuroscience program but later withdrew, was investigating whether he received any of the

alleged shipments while working as a research assistant at the Anschutz Medical Campus.Tales of heroism abound from Colorado movie theater Authorities have been tight-lipped about a

possible motive in the case, though police spokesman Frank Fania told CNN that Holmes has

been uncooperative with investigators and requested an attorney. The movie multiplex, where the shootings

occurred during a midnight screening of the new Batman move "The Dark Knight Returns," will

remain shuttered at least until Wednesday to give police time to complete their investigation and

allow the suspect's defense team access Tuesday. Aurora, meanwhile, is bracing for another

emotional week as families begin making funeral arrangements. It was not

immediately known when the coroner would release the bodies. On Monday, Holmes made his first court

appearance. Looking dazed at times, Holmes -- who after theattack identified himself to police as "The Joker" -- wore a maroon jumpsuit over a white T-shirt and gave little indication that he was paying attention

to the courtroom procedure that ensured he will continue to be held without bond. Grief counselors offer solace amid tragedy He was then led from the courtroom and back to the Arapahoe County Jail, where he

is being held in isolation. Formal

charges are expected to be filed

July 30.

"The charges on which the court

found cause included first-

degree murder," Arapahoe

County District Attorney Carol

Chambers told reporters outside

the courthouse. She said

prosecutors have a lot of work to

do.

"I would say there's no such thing as a slam-dunk

case," she said. "We're still looking at the

enormous amount of evidence."

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Deciding whether to pursue the death penalty is a

long process that involves input from victims and

their relatives, she said.

A capital case would require a finding of either

extreme indifference or deliberation, she said.

Holmes is being held in connection with the

shootings that killed 12 people and left 58 others

wounded. As of late Monday, at least 15 people

remained hospitalized -- five in critical condition --

in four area hospitals.

Four of those killed were active members of the

the U.S. military. The Department of Defense is

flying flags at half-staff in their honor.

"These acts of heroism and sacrifice are the

essence of what military service is about -- putting

your life on the line to defend those who are part

of the American family," Secretary of Defense

Leon Panetta said in a statement Monday.

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Meanwhile, Lisa Damiani, an attorney

representing the Holmes family but not the

suspect, said his family members were keeping

their location secret. "I don't think they would like

the media to know where they are," she said,

adding that she feared for their safety.

"They're doing as well as they can, under the

circumstances," Damiani told reporters at her

office in San Diego, California, where the family

lives. "I think everyone can imagine how they're

feeling -- anyone who's ever been a parent."

She added, "The family has elected not to discuss

James or their relationship with James at this

time."

The family issued a statement Friday saying, "Our

hearts go out to those who were involved in this

tragedy and to the families and friends of those

involved." It added, "We are still trying to process

this information."