The public gets its first glimpse of James Holmes, 24, the suspect in the Colorado theater shooting during his initial court appearance Monday, July 23. With his hair dyed reddish-orange, Holmes, here with public defender Tamara Brady, showed little emotion. He is accused of opening fire in a movie theater Friday, July 20, in Aurora, Colorado, killing 12 people and wounding 58 others. More photos: Mourning the victims of the Colorado theater massacre
(CNN) -- The man police say opened fire inside a crowded Colorado movie theater may have been planning the attack for months, the local police chief told reporters Saturday.
Suspect James E. Holmes, 24, is accused of killing 12 people and wounding 58 in the suburban Denver community of Aurora. He is also alleged to have rigged his apartment with booby traps so that whoever entered it would be seriously hurt or killed.
Holmes received a high volume of deliveries over the past four months to both his home and work addresses, which police believe begins to explain how he got his hands on some of the materials used in the attack and those found at his apartment, said Aurora Police Chief Daniel Oates.
"What we're seeing here is evidence of, I think, some calculation and deliberation," he said. "We have the evidence of a deliberative process to commit this assault, and we have the evidence of a deliberative process in his mind to attack whoever opened the door of his apartment."
"Make no mistake," said Oates, "this apartment was designed ... to kill."
Authorities continued Saturday making headway on the suspect's home.
Police focus on booby-trapped apartment
Colorado movie theater massacre
Shooting witness: Killer was stoic
Shooting witness thought attack was joke
Technicians, with the help of a robot, worked to handle traps, wires and possible explosive and incendiary devices, according to Jim Yacone, a special agent with the FBI who briefed reporters alongside Oates. Two devices were intentionally detonated at the site.
The operation proceeded with an eye toward preserving evidence, all of which will be sent to an FBI lab in Quantico, Virginia, Yacone said.
By Saturday evening, police said that "all hazards" had been removed from the suspect's apartment.
Hundreds of residents were evacuated from five buildings, including the modest, three-story brick building where Holmes told police he had rigged his top-floor, one-bedroom apartment with explosives. All occupants except those who live in the suspect's building were allowed to return home Saturday night, police said.
Remembering the victims through photos
Inside the theater
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Witness: He pointed gun at my face
Listen to theater shooting 911 calls
At least 26 victims of the shooting remained hospitalized Saturday -- nine in critical condition -- in five hospitals.
Grief counselors were staffing area high schools. And the city is planning a vigil Sunday night.
Also Sunday, President Barack Obama is expected to be in Aurora to meet with local officials and victims' families.
"I think that overall the community is very, very shaken, and I think we're in shock and I think we're still trying to get our arms around how did such a tragedy happen to us," said Rhonda Fields, a Colorado state representative. "There's a lot of hurt. There's a lot of uncertainty."
As the identities of those who died became public Saturday, Town Center at Aurora reopened for business, though its movie house -- Century Aurora 16 -- remained shuttered.
Police Chief Oates said he hoped his officers would be out of the theater by Monday to allow the suspect's defense team in there Tuesday. Theater owners could get the auditorium back Wednesday, he said.
Investigators have said little about what may have led the suspect to open fire during a premiere Friday of the Batman sequel "The Dark Knight Rises." The sold-out theater was filled with fans, some in costume.
The incident began unfolding late Thursday, when Holmes bought a ticket to the midnight show and entered the theater, a law enforcement source involved in the investigation told CNN.
Families of victims receive tragic confirmation
But Holmes soon went out a rear door leading from the theater to the parking lot, leaving it propped open, the source said. He gathered weapons before re-entering through the same door, said the source, who was not authorized to release the information.
He was back inside the theater a few minutes after the movie had begun and was dressed head-to-toe in black, authorities said.
Witnesses described him as wearing a gas mask that concealed much of his face and head.
Holmes' hair had been dyed red, and he later told police he was "the Joker," according to a federal law enforcement source with knowledge of the investigation. The source was not authorized to release details to the media.
The federal law enforcement source's information about the suspect's appearance fits with a statement made to reporters by New York Police Commissioner Ray Kelly, who said he had been briefed by Colorado authorities.
Police Chief Oates declined to release details about Holmes' appearance other than to describe what he was wearing: a ballistic helmet and protective gear for his legs, throat and groin, black gloves and a gas mask.
He said he would not release the booking photo "for investigative reasons."
Police said Holmes set off two gas-emitting devices before spraying the theater with bullets from an AR-15 rifle, a 12-gauge shotgun and at least one of two .40-caliber handguns that police recovered.
"There was blood everywhere," Christina Blache, a shooting victim, told CNN's Don Lemon from her hospital bed Saturday. Her friend was one of those killed.
"You're sitting in a movie theater trying to watch a movie with your friends. Who expects to be shot in a movie theater? None of us did," she said.
Robots reveal unique setup of suspect's apartment
Holmes had bought the guns legally at stores in the Denver area over the past two months, Oates said. More than 6,000 rounds of ammunition were also purchased online, according to the police chief.
A receipt obtained by CNN shows Holmes bought some of the tactical gear, including a vest and a magazine pouch, online on July 2.
Holmes surrendered without resistance within seven minutes of the first 911 calls from moviegoers, Oates said. He was arrested in the theater's rear parking lot.
"If you think we're angry, we sure as hell are angry about what has happened to our city, what has happened to these wonderful people who live here, and also what he threatened to do to one of our police officers," the police chief said.
Witness: 'Longest minute of my life'
The Joker has long been a fixture in Batman comics and was famously portrayed by Heath Ledger in 2008's "The Dark Knight," the predecessor to "The Dark Knight Rises." Ledger, who died in 2008, won a posthumous Academy Award for his portrayal of the villain who encourages anarchists to take over Gotham City.
Holmes, who is being held in Arapahoe County Jail, is scheduled to appear in court on Monday morning. The court file was sealed, according to a court order.
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CNN's Chelsea J. Carter, Carol Cratty, Ed Lavandera, Susan Candiotti, Joe Sutton, Mike Brooks, Sarah Aarthun and Jim Spellman contributed to this report.
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Police release the official photo from Holmes' booking after the shooting.
Holmes often had a blank stare during his court appearance Monday, appearing to be in a daze.
Victims and their relatives and journalists watch the proceedings Monday.
Flags fly at half-staff Monday at the Arapahoe County Courthouse in Centennial, Colorado, where the movie theater shooting suspect had his first court appearance. The prosecutor held a press conference outside the courthouse.
Arapahoe County District Attorney Carol Chambers talks to reporters Monday before heading into the courthouse. Chambers said the decision on whether to pursue the death penalty is a long process that involves input from victims and their families.
Family members of the victims arrive at the courthouse Monday for the suspect's first court appearance.
The Century Aurora 16 multiplex in Aurora becomes a place of horror after a gunman opened fire Friday in a crowded theater. At least 17 people remained hospitalized late Sunday, July 22, in the shooting rampage that shocked the nation.
Holmes is accused of opening fire during a midnight screening of the new Batman movie, "The Dark Knight Rises." Holmes purchased four weapons and more than 6,000 rounds of ammunition in recent months, police say.
Police investigate outside the Century 16 multiplex Saturday, July 21, a day after the mass shooting. Authorities have been tight-lipped about a possible motive in the case.
Agents search the suspect's car outside the theater.
Aurora police escort a sand-filled dump truck containing improvised explosive devices removed from Holmes' booby-trapped apartment Saturday. Authorities have said they believe the suspect rigged his place before leaving for the movie theater.
Police break a window at the suspect's apartment Friday in Aurora.
Law enforcement officers speak with Colorado Gov. John Hickenlooper, center, outside the suspect's apartment Saturday.
Law enforcement officers prepare to disarm the booby-trapped apartment Saturday.
Officials tow cars outside Holmes' apartment Saturday. Police disassembled devices and trip wires set up in the apartment.
Officers prepare to place an explosive device inside the apartment.
Debris flies out a window, right, after law enforcement officers detonate an explosive device inside the apartment Saturday.
People mourn the victims during a vigil behind the theater where a gunman opened fire on moviegoers in Aurora.
A woman grieves during a vigil for victims behind the theater.
A distraught woman receives counseling from Pastor Quincy Shannon, left, in front of Gateway High School in Aurora, where the families of the missing met following the shooting.
Lin Gan of Aurora holds back tears as she speaks to reporters about her experience in the Century 16 theater Friday.
People embrace before a vigil for victims behind the theater where a gunman opened fire on moviegoers.
Investigators work on evidence near the apartment of James Holmes on Friday.
Members of the Aurora Police Department SWAT unit walk near the apartment of James Holmes. Police have Holmes, 24, of North Aurora, in custody.
Television news crews gather in front of the home of Robert and Arlene Holmes, parents of 24-year-old mass shooting suspect James Holmes, in San Diego, California, on Friday.
A popcorn box lies on the ground outside the Century 16 movie theatre.
An NYPD officer keeps watch inside an AMC move theater where the film "The Dark Knight Rises" is playing in Times Square on Friday. NYPD is maintaining security around city movie theaters following the deadly rampage in Aurora, Colorado.
Adariah Legarreta, 4, is comforted by her grandmother Rita Abeyta near the Century 16 Theater in Aurora.
A cyclist and pedestrians pass a theater showing the latest Batman movie in Hollywood, California, on Friday. Warner Brothers said it was "deeply saddened" by Friday's massacre at a Colorado screening of "The Dark Knight Rises."
Obama supporters observe a moment of silence for the victims at a campaign event at Harborside Event Center in Fort Myers, Florida, on Friday.
Jessica Ghawi, an aspiring sportscaster, was one of the victims.
A woman waits for news outside Gateway High School, a few blocks from the scene of the shooting at the Century Aurora 16.
Aurora police chief Daniel J. Oates speaks at a press conference near the Century 16 Theater on Friday.
Agents search the trash container outside the suspect's apartment in Aurora.
A Federal ATF officer carries protective gear onsite at the home of alleged shooting suspect James Holmes.
Obama speaks on the shootings at the event in Fort Myers.
Moviegoers are interviewed at the Century Aurora 16.
Officers gathered at the theater Friday.
Investigators were a common sight at the theater Friday.
Authorities gather at the shooting suspect's apartment building in Aurora. Police broke a second-floor window to look for explosives that the suspect claimed were in the apartment.
Screaming, panicked moviegoers scrambled to escape from the black-clad gunman, who wore a gas mask and randomly shot as he walked up the theater's steps, witnesses said.
University of Colorado Hospital spokeswoman Jacque Montgomery said that all of the wounded had injuries from gunshot wounds, ranging from minor to critical.
A woman sits on top of her car near the crime scene.
Police block access to the Town Center mall after the shooting.
Witnesses told KUSA that the gunman kicked in an emergency exit door and threw a smoke bomb into the darkened theater before opening fire.
What is believed to be the suspect's car is examined after the shooting.
Republican presidential candidate and former Massachusetts Gov. Mitt Romney delivers remarks regarding the shooting in an Aurora, Colorado, movie theater on Friday at a campaign event in Bow, New Hampshire.
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