Updated at 7:56 p.m. ET
At least one person was killed and three others were injured in a shooting incident near two polling places in Azusa, Calif.
Dean Logan, the Los Angeles County county clerk, tweeted that voters were being told to "avoid the area and if necessary, cast a ballot at an alternate polling location."
One of the polling centers remains closed.
At a news conference, Azusa Police Chief Steve Hunt said the suspect is still "unaccounted for." Hunt said police are looking for a woman who was armed with an "assault-style weapon."
The Los Angeles County Sheriff's Department, which has taken over the investigation of the incident, tweeted that the incident "does not appear to have any direct connection to the election/polling places."
Television images showed police responding in armored vehicles and emergency personnel treating the wounded and and placing them on helicopters.
Azusa is about 20 miles east of Los Angeles. Hunt said it was still not clear whether the shooting had anything to do with the voting process.
The shooting happened in front of Memorial Park, which is also a polling station.
The Azusa Police Department said the shooting began a little after 5 p.m. ET. Officers found "multiple shooting victims" and they "came under fire."
Police are now concentrating on a home in the area. Azusa police said the situation had transitioned from "active" to "barricade/containment."