5 dead — including police officer — in Missouri mass killing

At least five people — including a local police officer and the alleged gunman — are dead following a mass killing at a gas station in Springfield, Missouri, the Associated Press reported Monday.

What are the details?

According to reports, the unnamed gunman entered the gas station and began shooting late Sunday after crashing into the Kum & Go gas station. NBC News reported that the two officers who first responded to the attack were "immediately fired upon by the suspect."

When police officers were able to gain access to the scene, they discovered three dead citizens. The gunman reportedly died of a self-inflicted gunshot.

The outlet also reported that the police department received calls about three separate shootings within a five-mile radius before the attack at the gas station.

Springfield Police Chief Paul Williams announced that a second officer was injured along with another local citizen. Authorities are working to determine a motive in the deadly attack.

KYTV-TV reported that Williams said, "It's way too early. ... I'll leave it at that."

Police have yet to identify the other victims involved in the killing, but revealed that Officer Christopher Walsh, 32, was shot and killed. Walsh was with the department for more than three years. Officer Josiah Overton, 25, was also injured but his injury is not life-threatening.