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Most of the victims were in their 20s. The youngest was a 6-year-old girl, Veronica Moser-Sullivan, whose mother remains in critical condition with a bullet wound to the neck. The oldest was 51-year-old Gordon Cowden, who attended the movie with his two teenage children, both of whom escaped unharmed.

Colorado Gov. John Hickenlooper said Sunday that his chief of staff took a group of young people Saturday night to see “The Dark Knight Rises” in order to make a statement about living in fear in the face of violence.

“The response to terrorism is not to shrink away, but to rise up and face it,” Mr. Hickenlooper told David Gregory on NBC’s “Meet the Press.” “We’re not going to let this son of a gun win, we’re not.”

The president added the visit to his schedule late Saturday, as both he and Republican presidential candidate Mitt Romney suspended their campaign activities in the battleground state for the time being.

The mass slaying has renewed calls by progressives for stricter gun-control laws, but White House press secretary Jay Carney said Mr. Obama has no plans to push for new legislation.

Mr. Obama, in his comments, didn’t talk about gun legislation specifically but did say, “I hope that over the next several days, next several weeks and next several months, we all reflect on how we can do something about some of the senseless violence that ends up marring this country.”

The owner of a firing range, meanwhile, said Mr. Holmes inquired about a membership. But he decided not to let Mr. Holmes in because of the strange, off-putting message on his answering machine.

Glenn Rotkovich, who runs the Lead Valley Range in Byers, Colo., said he instructed his staff to alert him if Mr. Holmes arrived to follow up on his membership request.

“I told my staff … ‘If he shows up, come get me. I need to talk to him before anything else,’” Mr. Rotkovich told Fox News. “I said, ‘I’m not sure about this guy.’ It was kind of bizarre.”

Across the street from the Century 16 theater, an Illinois man erected 12 white crosses Sunday with the names of the victims of Friday’s early-morning massacre.

Greg Zanis is no stranger to Colorado: He set up crosses in 1999 to honor those who died in the Columbine High School shooting. Mr. Zanis put up 15 crosses near the high school representing the 13 victims and two gunmen, who committed suicide, but the father of one victim later tore down the last two crosses.

“I’m the guy who put up the Columbine crosses, and I’m back here again,” said a tearful Mr. Zanis, who prayed at the crosses with Aurora Mayor Steve Hogan. “This is so hard to be back here.”

Mr. Holmes has an 8:30 a.m. Monday court date at Arapahoe County District Court. Police said he has retained an attorney.

A student at the University of Colorado Denver’s neuroscience program, Mr. Holmes spent months obtaining four firearms and 6,000 rounds of ammunition through local gun shops and the Internet, according to Aurora police.

A federal law-enforcement official told the Associated Press that the attacker’s semiautomatic assault rifle jammed during his rampage, which likely saved some lives when he had to switch to a less-powerful weapon.

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