AURORA, Colo. — The shooting suspect accused in a deadly rampage inside a Colorado theater planned the attack with "calculation and deliberation," police said Saturday, receiving deliveries by mail that authorities believe armed him for battle and were used to rig his apartment with dozens of bombs.

Meanwhile, new details about 24-year-old James Holmes emerged, including summer jobs the suspect held in Southern California as a camp counselor and as an intern at a prominent research institute.

In Aurora, investigators spent hours Saturday removing explosive materials from inside Holmes' suburban Denver apartment a day after police said he opened fire and set off gas canisters in a theater minutes into a premiere of the Batman film "The Dark Knight Rises." The massacre left 12 people dead and 58 injured.

His apartment was rigged with jars of liquids, explosives and chemicals that were booby trapped to kill "whoever entered it," Aurora Police Chief Dan Oates said, noting it would have likely been one of his officers.

Holmes received several mail deliveries over four months to his home and school and bought thousands rounds of ammunition on the Internet.

"He had a high volume of deliveries," Oates said. "We think this explains how he got his hands on the magazine, ammunition," he said, as well as the rigged explosives in his apartment.

"What we're seeing here is evidence of some calculation and deliberation," Oates added.

Inside the apartment, FBI Special agent James Yacone said bomb technicians neutralized what he called a "hyperbolic mixture" and an improvised explosive device containing an unknown substance. There also were multiple containers of accelerants.

"It was an extremely dangerous environment," Yacone said at a news conference, noting that anyone who walked in would have sustained "significant injuries" or been killed.

By late afternoon, all hazards have been removed from the Holmes' apartment and residents in surrounding buildings were allowed to return home, police said.

The exception was Holmes' apartment building, where authorities were still collecting evidence. Inside the apartment, authorities began covering the windows with black plastic to prevent onlookers from seeing in. Before they did, a man in an ATF T-shirt could be seen measuring a poster on a closet that advertised a DVD called "Soldiers of Misfortune." The poster showed several figures in various positions playing paintball, some wearing masks.

About 8 p.m., police left the apartment building carrying a laptop computer and a hard drive.

While authorities continued to refuse to discuss a possible motive for one of the deadliest mass shootings in recent U.S. history, details about Holmes' background as a student and would-be scientist trickled out Saturday.

Holmes had recently withdrawn from a competitive graduate program in neuroscience at the University of Colorado-Denver, where he was one of six students at the school to get National Institutes of Health grant money. He recently took an intense three-part, oral exam that marks the end of the freshman year of the four-year program there, but university officials would not say if he passed, citing privacy concerns.

In a resume posted on Monster.com, Holmes listed himself as an "aspiring scientist" and said he was looking for a job as a laboratory technician.

The resume, first obtained by The Press-Enterprise in Riverside, paints a picture of a brilliant young man brimming with potential: He worked as a summer intern at the Salk Institute for Biological Studies in La Jolla in 2006 and mapped the neurons of Zebra finches and studied the flight muscles of hummingbirds while an undergraduate at the University of California, Riverside.

He also worked as a cabin counselor to underprivileged children at a summer camp in Los Angeles in 2008. In a statement, Camp Max Straus confirmed Holmes had worked there for eight weeks. The camp provided no other detail about Holmes but said such counselors are generally responsible for the care and guidance of roughly 10 children.

Neighbors and former classmates in California said although Holmes was whip-smart, he was a loner who said little and was easily forgotten – until this week.

Mary Muscari, a criminology professor at Regis University in Denver who studies mass killings, said she was not surprised Holmes was studying neuroscience and mental disorders.

"It could be he was interested in that because he knows there's something different in him," she said.

Holmes was in solitary confinement for his protection at a county detention facility Saturday, held without bond on suspicion of multiple counts of first-degree murder. He was set for an initial hearing on Monday and has been appointed a public defender.

Among the deceased victims was a 6-year-old girl and a man who died on his 27th birthday and a day before his anniversary. Families grieved and waited at hospitals, which reported at least seven wounded still in critical condition Saturday and others with injuries that likely are permanent.

Veronica Moser-Sullivan, 6, had gone to the movies with her mother, who was drifting in and out of consciousness in a hospital intensive care unit, bullets lodged in her throat and a gunshot wound to her abdomen.

"Nobody can tell her about it," Annie Dalton said of her niece, Ashley Moser. "She is in critical condition, but all she's asking about is her daughter."

Veronica had just started swimming lessons on Tuesday, Dalton said.

"She was excited about life as she should be. She's a 6-year-old girl," her great aunt said.

Another victim, 27-year-old Matt McQuinn, was killed after diving in front of his girlfriend and her older brother to shield them from the gunfire, said his family's attorney, Rob Scott of Dayton, Ohio.

Alex Sullivan had planned a weekend of fun, first ringing in his 27th birthday with friends at the special midnight showing of "The Dark Knight Rises" and then celebrating his first wedding anniversary on Sunday.

"He was a very, very good young man," said Sullivan's uncle, Joe Loewenguth. "He always had a smile, always made you laugh. He had a little bit of comic in him."

President Barack Obama, who called in his weekly radio address for prayer and reflection on the rampage, was scheduled to travel to Colorado on Sunday to visit with the families of victims.

During the attack early Friday, Oates said Holmes used a military-style semi-automatic rifle, a shotgun and a pistol to open fire on the unsuspecting theater-goers. He had bought the weapons at local gun stores within the last two months. He recently purchased 6,000 rounds of ammunition over the Internet, the chief said.

Holmes also bought an urban assault vest, two magazine holders and a knife for just over $300 on July 2 from an online supplier of tactical gear for police and military personnel, according to the company.

Chad Weinman, CEO of TacticalGear.com, said his company processes thousands of orders each day, and there was nothing unusual in the one that Holmes placed.

"Everything Mr. Holmes purchased on July 2 is commercially available," Weinman said, adding he was "appalled" that the material was sold to Holmes before the shooting.

The Batman movie, the last in the trilogy starring Christian Bale, opened worldwide Friday with midnight showings in the U.S. "The Dark Knight Rises" earned $30.6 million in Friday morning midnight screenings and according to industry estimates roughly $75 million on that day. That put it on track for a weekend total of around $165 million, which would be the second-highest opening weekend ever, following "The Avengers."

The shooting was the worst in the U.S. since the Nov. 5, 2009, attack at Fort Hood, Texas. An Army psychiatrist was charged with killing 13 soldiers and civilians and wounding more than two dozen others.

_____

Associated Press contributors to this report include Kristen Wyatt, Steven K. Paulson, Ivan Moreno, P. Solomon Banda in Aurora; Dan Elliott, Nick Riccardi and Colleen Slevin in Denver; Gillian Flaccus in Aurora, Colo; AP Entertainment Writer Jake Coyle in New York; M.L. Johnson in Chicago. Brian Skoloff in Salt Lake City; Monika Mathur and Jennifer Farrar at News Research Center in New York; and Alicia A. Caldwell and Eileen Sullivan in Washington.

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@ HuffPostPol : Obama: Scripture says that he will wipe away every tear from their eyes, and death shall be no more...

@ HuffPostPol : Obama: We can all understand what it would be like to have someone that we love taken from us in this fashion

@ HuffPostPol : Obama: I also had the chance to give folks some hugs and to shed some tears ... and also to share some laughs.

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The AP reports:

The images brought it all back for survivors of the 1999 Columbine massacre. The blood. The tears. The confusion and the heartache, the elusive search for a reason why.

Paralyzed in the Columbine shootings, Anne Marie Hochhalter, now 30, says friends still reach out to alert her to prepare for disturbing images on the news. She got a text message Friday morning when she woke up. Warning, it said. There was another one, this time close to home.

Hochhalter took a deep breath and turned on the TV.

"My heart just fell," Hochhalter said Sunday. "It brought back a lot – flashbacks from that day. At the time I was so hurt I wasn't watching the news, you know, watching it like other people were. But this time, I was right there, seeing it all."

Columbine students who survived what in 1999 was the worst school massacre in U.S. history are re-living their own experiences. And they're banding together to try to help. On Facebook and by phone, they are reaching out to people who witnessed Friday's early-morning slayings of 12 people at a movie theater in Aurora.

Young people were victims and witnesses in both shootings. The Columbine survivors are telling those at the movie theater that the road ahead of them won't be easy.

Click here to read more.

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Reuters reports:

President Barack Obama's re-election team, maintaining an unofficial time-out on full-scale campaigning following a deadly shooting at a movie theater, said on Sunday it will keep its advertisements off the airwaves in Colorado for the rest of the week.

Obama and his Republican rival Mitt Romney both set aside the previously harsh tone of the November 6 election campaign to speak soothingly to the nation on Friday, after the shooting rampage that killed 12 at a midnight movie screening outside Denver.

Click here to read more.

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@ JordanGhawi : Sat down with President Obama. He has been incredible. He too has agreed not to mention the shooter's name.

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The AP reports:

President Barack Obama dashed to Colorado on Sunday to meet with families of those gunned down in a movie theater and to hear from state and local officials about the shooting that left 12 people dead and dozens more injured.

Air Force One touched down at Buckley Air Force Base in Aurora late Sunday afternoon for the president's hastily arranged 2 1/2-hour visit, which includes a private meeting with the victims' loved ones and perhaps a public comment about the shooting early Friday morning at a busy multiplex.

Colorado Gov. John Hickenlooper, Aurora Mayor Steve Hogan and Aurora Police Chief Dan Oates were among those who greeted Obama at Buckley.

The president is expected to speak at 7:30 p.m. ET.

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@ BreakingNews : Police in Aurora, Colo. say shooting suspect James Holmes is not cooperating with authorities - @SkyNewsBreak

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ABC on Sunday aired a clip of shooting suspect James Eagen Holmes. The clip showed Holmes discussing the idea of "temporal illusion" at science camp when he was 18.

"It's an illusion that allows you to change the past," he says.

To watch the video, click here.

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Authorities have identified the 12 victims who were killed early Friday morning in the Aurora, Colorado movie theater shooting.

The deceased included an aspiring sports reporter, a 6-year-old girl and a man celebrating his birthday.

For more about the victims, read the AP's report.

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Audio of the first hour of the police and fire response to the Colorado shooting was made available this weekend via RadioReference.com.

To listen to the recordings, click here (warning: extremely graphic content).

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James Holmes' gun jammed during the attack, a law enforcement source told the Associated Press.

The claim was made based on leftover bullets found in a magazine at the crime scene, the official said. The jam likely caused the suspect to change weapons in the middle of the attack.

More on this story here.

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@ KyleClark : Aurora PD reaffirms NO 2nd #theatershooting suspect: "An associate of Holmes was interviewed... no reason to believe that he is involved."

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Local station FOX31 reports:

Sources tell Justin Joseph someone made either a call or a text from the person of interest’s phone threatening violence if James Egan Holmes was not released from jail. That call prompted police to issue an alert to find and detain him.

Click here to read more.

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@ ProducerMatthew : KDVR report: Second "person of interest" sought by police in Aurora, Colorado mass shooting - http://t.co/ICWoWzKS

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From the AP:

Holmes apparently had prepared the attack at the Aurora theater well in advance, receiving multiple deliveries by mail for four months to his home and school and buying thousands rounds of ammunition on the Internet, Oates said.

"He had a high volume of deliveries," Oates said. "We think this explains how he got his hands on the magazine, ammunition," he said, as well as the rigged explosives in his apartment.

"What we're seeing here is evidence of some calculation and deliberation," Oates added.

Read more here.

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From HuffPost's Sam Stein:

The White House announced on Saturday night that the president will make a stop in Aurora this Sunday. The guidance, which does not say whether or not President Obama will make public remarks (as he did following the Giffords shooting), is copied below:

On Sunday, the President will depart the White House en route Colorado. The departure from the South Lawn and arrival at Buckley Air Force Base are open press. In Aurora, Colorado, the President will visit with families of victims of the shooting as well as local officials. In the evening, the President will depart Aurora, Colorado en route San Francisco, California. The departure from Buckley Air Force Base and arrival at San Francisco International Airport are open press.

The President will spend the night in San Francisco.

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@ denverpost : EXCLUSIVE: President Barack Obama to visit Aurora #theatershooting victims and families Sunday: http://t.co/onz2ojZM

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The New York Times has more details about James Holmes, including details from his day-to-day life:

"...Mr. Holmes struggled through his first academic year at the University of Colorado, Denver, and had dropped out by this spring. Neighbors from his gang-ridden neighborhood in Aurora described him as a solitary figure, recognizable as one of the few white residents of a largely Hispanic neighborhood, and always alone. Alone as he bought beer and liquor at neighborhood shops, as he ate burritos at La California restaurant or got his car fixed at the Grease Monkey auto shop. Alone as he rode his bicycle through the streets."

Read more here.

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@ jeffrossen : BREAKING: All hazards have been removed from James Holmes' apartment...per Aurora Police.

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@ BreakingNews : Colorado shooting suspect being held in solitary confinement for his own protection, says Arapahoe Co. sheriff

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The AP has a complete list of Aurora shooting victims. View it here.

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From TMZ:

A profile on a popular sex website appearing to be that of Colorado shooting suspect James Holmes is authentic ... so say sources connected to the website.

As TMZ first reported, the profile appeared on the website adultfriendfinder.com just days before the "Dark Knight Rises" massacre. The profile included a cryptic message on the top which reads, "Will you visit me in prison?"

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HuffPost's Sharon Carty reports:

When Peter Burns' cell phone rang at 2:15 a.m. Friday, he glanced at the caller ID with eyes blurred from sleep, and decided to ignore it.

It was Jordan Ghawi, a family friend. He figured he'd just call him back.

But at 5:15, his phone rang again. This time colleagues from a radio station where he used to work in San Antonio were calling to tell him his friend, and their former intern Jessica Ghawi had been killed the night before at a theater in Aurora, Colo.

At a midnight showing Friday of the latest Batman movie in Aurora, Colo., a gunman, identified by police as 24-year-old James Holmes, opened fire killing 12 people and wounding 58.

Burns, a local morning radio talk show host with Mile High Sports in Denver, had to make a decision: Call out of work, or go on the air. He decided to fill his show talking about his friend to take the focus off the shooter.

"I decided I'll do every single interview if it means we can't get this coward any airtime," Burns told The Huffington Post.

Full story here.

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Via The Denver Post:

Sometime late Thursday, Alex Sullivan posted this message on his Facebook page: "#TheDarkKnightRises OMG COUNTING down till it start cant wait going to be the best birthday ever."

Sullivan died on his 27th birthday. He and seven co-workers from a Red Robin restaurant had gone to the premiere. All eight were injured.

Full story here.

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Via HuffPost Denver:

At a Saturday press conference, Aurora Police Chief Dan Oates provided details of Holmes' booby-trapped apartment. The place was designed "to kill whoever entered it."

"It was going to be a police officer... we sure as hell are angry," Oates said. "It's mind-boggling for me."

Two devices were set off in the afternoon, and the evidence "will continue to take some time" to gather, Oates said.

Read more here.

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@ AP : Police chief: Suspect in Colorado theater shooting booby-trapped his apartment specifically to target police: http://t.co/OXwfVOcu -CC

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@ denverpost : UPDATE: Officials hope to let neighbors of #theatershooting suspect's apartment into homes Sunday: http://t.co/aqhDcyrM

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@ AP : BREAKING: FBI says anyone who had opened door to apartment of theater shooting suspect would have been seriously injured or killed

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@ AP : BREAKING: Aurora police chief believes major threats were eliminated from shooting suspect's apartment

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@ nydailynews : Jailed shooting suspect James Holmes is 'spitting on guards,' thinks he's in a movie http://t.co/hQTx8ybQ #Aurora

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@ NBCNews : People with same name as #Aurora, CO shooter hounded on social media http://t.co/pqxLFOC1

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