One person is dead and three more were injured in a shooting in Azusa, California, a northern suburb of Los Angeles. Two nearby polling stations and two schools have been placed on lockdown. Police are looking for a female suspect barricaded inside a home.

One person is dead and three others have been shot, LA County Fire Inspector Gustavo Medina told CNN. The Los Angeles Fire Department said earlier that they were treating four patients as a result of the incident.

The shooting was first reported around 2pm local time (5pm eastern). The suspect "pinned down" a number of local police officers, who were all safe and accounted for, police said Tuesday afternoon.

Just in: Polling Station in Azusa, California on lockdown after shots fired nearby; at least two victims - LA Cty Sheriff #ElectionDay — Jim Sciutto (@jimsciutto) November 8, 2016

Few details are known about the shooting, which Officer Jerry Willison of the Azusa Police Department described as “a very volatile and critical situation,” according to the Los Angeles Times.

AZUSA UPDATE: 3 confirmed shot, 1 deceased; also someone down at front door in unknown condition https://t.co/C8nRNwa2wBpic.twitter.com/d1bBGtdB3E — ABC7 Eyewitness News (@ABC7) November 9, 2016

The suspect is apparently barricaded at a local residence and surrounded by law enforcement. One person in the doorway of the residence is in unknown condition.

Officials: At least 2 people injured in shooting in Azusa, Calif.; multiple police units on scene - KTLA pic.twitter.com/tkvVTfofzn — BreakinNewz (@BreakinNewz01) November 8, 2016

Slauson Middle School and Mountain View Elementary School have also been placed on lockdown, the Azusa Unified School District confirmed.

Voting information left unattended at Mountain View School in #Azusa. It's on lockdown because of nearby shooting. pic.twitter.com/SvIUbkKN76 — Sandra Molina (@MolinaSGVN) November 9, 2016

Multiple people taken to hospital after shooting in Asuza, per @CBSLApic.twitter.com/OQ9TACbnX8 — WPEC CBS12 News (@CBS12) November 8, 2016

There are about 30 people at two polling locations affected by the incident. Local authorities said they were "monitoring" the situation and advised voters to "avoid the area and, if necessary, cast a ballot at an alternate polling location."

Monitoring #ActiveShooter situation in Azusa. Two polling locations currently impacted - Memorial Park & Dalton Elementary in Azusa (cont). — Dean Logan, RR/CC (@LACountyRRCC) November 8, 2016

For those of you in #Azusa that still need to vote, the City is redirecting voters to Foothill Community Church at 777 E Alosta. #mydayinla — heather. (@hnjohnso) November 8, 2016

One witness has offered a description of the suspect.

@AzusaPD my sister in law is in lockdown at polling place. She saw shooter. Slightly overweight, bald white male. White shirt, black vest. — Lindsay (@lamcelwain) November 8, 2016

However, police said the suspect was female and armed with an "assault rifle."

It is unclear if the shooting is in any way related to the ongoing elections. One of the people shot was reportedly on the way to vote, local media said.

Don't know yet if this tragedy in #Azusa CA has anything to do with the election but it wouldn't surprise me. This election has been hellish — Desert Punk (@TheFaulkLine) November 8, 2016

Azusa is a city of some 50,000 northeast of Los Angeles, at the foot of the San Gabriel mountains.