One person is dead and three others were injured following reports of a shooting near a Los Angeles-area polling station.

Los Angeles County fire inspector Gustavo Medina said one person was dead on arrival at 2pm this afternoon, two people had been airlifted to hospitals and a fourth is being treated after an incident in Azusa.

An elementary school which is being used as a polling station is on lockdown.

Azusa police officer Jerry Willison said someone fired on officers at the scene, forcing them to take cover, but none of them were hurt.

No arrests have been made so far.

Local media report that the shooter is still active in the area and that as many as four people have been taken to hospital with injuries.

It is understood the shooting involved police officers who were ‘met by gunfire at the scene’.

Speaking at the scene of the incident, Azusa police officer Jerry Wilson told reporters officers were pinned down by gunfire and that ‘authorities worked to extract officers’.

Police have described the situation as ‘not contained’.

Azusa Police tweeted: “Critical incident: Please stay out of the area of Fourth St & Orange Ave. All residents in the area shelter in place.”

Critical Incident: Please stay out of the area of Fourth St & Orange Ave. All residents in the area shelter in place. — Azusa Police (@AzusaPD) November 8, 2016

More to follow.