(MCT) — A lone 24-year-old masked gunman entered a Colorado movie theater playing the new Batman movie and opened fire early Friday, killing at least 12 people and wounding 50, according to police and local media. The suspect, a white male, was found in the parking lot and did not resist arrest, CNN said.

Witnesses described a chaotic scene, telling television reporters that they were overcome by noxious gas unleashed by the suspect just before he started shooting, and that they had to decide between staying on the ground, helping wounded victims or running away before the gunman was able to reload his weapon. Survivors said they were forced to run past bodies in the aisles and theater.