A total of 58 people were wounded and 12 killed, in a shooting on Friday at a movie theater in the U.S. town of Aurora, outside Denver, Huffington Post reported citing Aurora Police Chief Dan Oates.

Earlier reports said that at least 10 people were killed and 50 wounded in the shooting.

Thirty people remain in hospitals after the attack with 11 of them in critical condition, Oates said.

The gunman, identified as James Eagan Holmes, 24, entered the theater during the premier of “The Dark Knight Rises,” set off two devices that let out an “irritant or smoke” and then opened fire on people.

Oates said that the assailant was dressed in all black, wore heavy body armor and is believed to have used three guns in the attack, which are an assault rifle, a shotgun, and a 40-caliber Glock. Police later discovered another gun in his car.

He said police received the first call about the shooting 39 minutes after the midnight and a total of 25 officers responded in less than two minutes eventually arresting Holmes in the back of the theater, who "surrendered without any significant incident for our officers.”

“We are not looking for any other suspects. We are confident that he acted alone,” Oates was quoted as saying.

The police chief declined to speculate on possible motives of Holmes saying only that the shooter had no previous criminal record except for speeding tickets.