A SWAT team was called after witnesses heard gunshots coming from an Aurora, Colo. home near the 16000 block of East Ithaca Place at about 3 a.m., Sgt. Cassidee Carlson said. According to the Denver Post, SWAT members shot the gunman after he went to the second-floor window of the townhouse and shot at police.

The gunman fatally shot two men and a woman, police reported. One woman escaped the home by jumping from an upstairs back window and called police just before 3 a.m. The woman sustained no injuries, according to the Los Angeles Times.

Carlson said the suspect fired at officers around 8:15 a.m., and was killed in a shootout about 45 minutes later when police entered the home.

It is still unclear if police killed the suspect, or if he shot himself.

Carlson told the Denver Post that this was "a worst case scenario" in terms of the outcome.

Carlson also said police intermittently attempted to negotiate with the suspect while he was throwing furniture against the doors of the townhouse to barricade them. Witnesses said police used a bullhorn to try to coax the man out of the house.

The suspect answered his phone several times but his remarks were unintelligible. He was extremely agitated. "He was not making sense," Carlson told the Post.

One neighbor said police referenced the suspect's wife, and repeatedly called the suspect, "Sonny." Police have declined to identify the suspect.

Police entered the home after the shooting ceased and found the bodies of three adult victims on the first floor. It is unknown whether the victims were in different rooms, The Post reported. They discovered the suspect's body on the second floor.

The identities of the victims have also not been released. Carlson also said the relationships between the victims is unclear, but they may all be related.

The motive of the killings is also unknown.
 
There were about 14 mass shootings that occurred across the United States in 2012, and the Aurora, Colo. movie theatre massacre has remained in the spotlight as one of the deadliest in U.S. history, according to the Washington Post. Prosecutors go to court Monday to outline the case against the suspect, James Holmes, who has not entered a plea. 

Read more about the Colorado shootings. 

Learn more about 2012 U.S. mass shootings here.

Reach Executive Producer Brianna Sacks here.