(The Blaze/AP) -- Police in Colorado say the suspect in one of the worst shootings in U.S. history is not cooperating with authorities.
Aurora Police Chief Dan Oates has said that 24-year-old James Holmes has "lawyered up" and is not talking.
Holmes was arrested Friday after a gunman opened fire during a midnight screening of "The Dark Knight Rises," killing 12 people and injuring 58. He has been appointed a public defender and is scheduled to make an initial court appearance on Monday.
CBS has video of Oates' update, with more information:
One of the overnight speculations that Oates addressed was whether Holmes may have had an accomplice of some sort.
A witness from the theater says he recalls seeing someone check his phone before the shooting, and then go to the exit door, where Holmes reportedly entered.
"So he went out toward the emergency exit doorway, which I thought was unusual to take a phone call," the witness explained, "and it seemed like he probably pried it open, or probably did not let it latch all the way."
He continued: "As soon as the movie started, somebody came in, all black, gas mask, armor, and threw a gas can into the audience, and it went off, and then there were gunshots that took place."
MSNBC has more information:
But Oates says the police are convinced that the shooter acted alone, even after investigating an unnamed "person of interest."
"All the evidence we have, every single indicator, is that . . . this was all Mr. Holmes' activity and he wasn't aided by anyone else," Oates maintained on Face the Nation.
"We're building a case to show that this was a very deliberative process by a very intelligent man who wanted to do this."
Oates also warned that it could take months to determine a motive and police are working with FBI behavioral analysts.