At least 12 people were killed and 50 were wounded when a gunman opened fire during an early Friday morning screening of the new Batman movie at an Aurora, Colorado, theater, Police Chief Dan Oates told reporters.
The man suspected of opening fire on the crowded theater was taken into custody, Oates said.
The heavily armed suspect, who was wearing a bulletproof vest, was apprehended by police in a parking lot at the theater, Frank Fania, a police spokesman told CNN. The identity of the suspect has not immediately been released.
"We do not have evidence of a second gunman," Oates said.
Of the wounded, at least 20 were being treated at the University of Colorado Hospital, said spokeswoman Jacque Montgomery. All of the wounded suffered from gunshot wounds, which ranged from minor to critical, she said.
"They're arriving by police, by ambulance. Some are walking in," she said.
The shooting incident occurred during the showing of "The Dark Knight Rises" at the Century Aurora 16 theater, police and witnesses said.
"We saw people running around and screaming," a man, who was not identified, told KUSA.
He said there was confusion in the theater when the shooting began because many believed the sound of gunfire was coming from the movie next door.
Oates said that the suspect used some sort of "smoke device" before opening fire in the theater.
Witnesses, however, told KUSA that the gunman kicked in an emergency exit door and threw a smoke bomb into the darkened theater before opening fire.