According to Fox News, the gunman, who has yet to be identified, reportedly took four people hostage inside a home in Aurora, Colo. The gunman and three hostages were killed, while one of the hostages was able to get out alive.
Officers were called to the home around 3 a.m. after reports of shots fired, reported the New York Daily News. Sgt. Cassidee Carlson said an "armed and dangerous" man was inside and refused to surrender to police. After six hours, officers shot and killed the suspect and discovered three bodies inside the home.
Roads leading to the home were closed off and police sealed off the scene. Neighbors said they smelled tear gas later Saturday morning. The standoff involved as man as 40 officers, including a SWAT team and hostage negotiators.
The identity of the victims and what prompted the incident is still unclear.
GlobalPost previously reported on a shooting that occurred at a theater in the same Colorado town during a premier of the newest Batman movie, The Dark Knight Rises, where 12 were killed and 40 were wounded.