A polling station in California was placed on lockdown Tuesday following a nearby shooting that left one person dead and three wounded, authorities and news reports said.

The shooting took place in early afternoon in the city of Azusa, 40 kilometers (25 miles) east of Los Angeles, Vanessa Lozano, spokeswoman for the Los Angeles County Fire Department told AFP.

She said three people were transported to a hospital with gunshot wounds and one was dead on arrival.

Voters say they were told to stay inside the polling center after shot rang out nearby, according to media reports.

Details about the incident, which happened in a residential neighborhood, were sketchy.

In addition to a polling station, a school was also placed on lockdown, according to local news reports.

Millions of Americans turned out Tuesday to decide whether to send Hillary Clinton to the White House as their first woman president or to put their trust in maverick populist Donald Trump.