Police officers are seen at the scene of a shooting near a polling station, in Azusa, California, US November 8, 2016. [Photo/Agencies]

LOS ANGELES - A polling station in Southern California was locked down on Tuesday following a shooting in Azusa, leaving one people killed and two others critically injured.

The incident occurred in a restaurant near W 5th street and N Orange Avenue, some 1.5 km away from the nearest polling station in Azusa, a small town about 50 km from Los Angeles, witnesses told Xinhua,

A person with an assault rifle left the scene and hide inside a two-floor apartment one block away, they added.

Police have surrounded the building, where a body was found lying on the ground outside.

Los Angeles Times quoted fire officials as saying since the situation was not "contained," not all the injured have received treatment.

Azusa, located in Los Angeles County, has about 46,000 residents.