An urgent search is underway for multiple suspects after a shooting in downtown Sacramento, California, left six people dead and 12 others injured early Sunday morning.

Investigators are working to identify those responsible for this horrific act. A large fight took place just prior to the shootings. And we have confirmed that there are multiple shooters," Sacramento Police Chief Katherine Lester said Sunday afternoon.

Three men and three women were killed, Lester said, and the injured were rushed to area hospitals. The coroner's office is working to identify and notify families of the victims.

Investigators were interviewing a number of witnesses and located hundreds of pieces of evidence from the scene, including a stolen handgun, Lester said.

Officers quickly responded to the scene near 10th Street and K Street after hearing gunshots around 2 a.m. and seeing people running, the police chief said.

The scene is within a few blocks of several notable landmarks: the California State Capitol, Sacramento City Hall and the Golden 1 Center, which hosts concerts and sporting events.

A large crowd was gathered in the area when gunfire erupted but it was unclear whether the crowd was connected to a particular venue or event, Lester said.

Members of the public have sent in tips and video related to the shooting, the chief said, and part of the incident was captured by a nearby police camera.