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Two polling stations in California were closed earlier today after a female shooter killed at least two people and wounded two others.

"We believe that the suspect is armed with an assault rifle with a rapid fire capability," said Acting Chief of Police Captain Steve Hunt.

Three people were transported to a hospital with gunshot wounds and one was dead on arrival, local police confirmed.

Two polling stations in the area were closed down earlier today along with nearby schools, according to local officials.

Los Angeles County Registrar Dean Logan said the shooting had affected two polling stations - Memorial Park, a preschool, and Dalton Elementary school but that Dalton Elementary was now open again.

"The polling location at Dalton Elementary School is open and operational.  Memorial Park remains closed," Dalton tweeted.

Azusa police have advised people to stay away from the area until officers have apprehended the suspect, who is reportedly heavily armed.

One witness said there were around thirty people in the polling booth at the time. She told CNN that she heard shots shortly before the police placed the area on lockdown.

"At first, I thought it was construction but people came running into the room saying they see a guy with a bulletproof vest and a white shirt," she said.