A gunman shot several people Tuesday in the Azusa community of Los Angeles County, killing one, scattering would-be voters, and forcing a lockdown of at least one polling site.

Up to five people may have been injured.

Los Angeles County Registrar-Recorder/County Clerk Dean Logan tweeted that voters should seek alternate polling places because the Tuesday afternoon shooting impacted two voting sites, including an elementary school.

County Fire Inspector Gustavo Medina says one person was dead on arrival Tuesday, two people were airlifted to hospitals and a fourth was being treated. He was unable to say whether the four people had been shot.

Azusa police Officer Jerry Willison says someone fired on officers at the scene, but none of them were hurt. He says the officers had to seek cover.

He says no arrests have been made.

Police also were asking residents to shelter in place after the incident, in which officers reporting to the scene encountered gunfire themselves,

forcing them to seek cover, Officer Jerry Willison of the Azusa Police Department told USA TODAY.

Both of the polling sites were on lockdown due to the shooting, KCBS and KCAL were reporting.

Willison said there have been civilian injuries, but he had not further details.

The Los Angeles County Sheriff's Department said via Twitter that it was helping with the investigation.

Azusa sits at the foot of the San Gabriel Mounts and has about 46,000 residents.