US synagogue shooting leaves one dead

A gunman has opened fire at a synagogue in California, leaving one woman dead and three other people injured, police say.

A 19-year-old man has been arrested after the attack at Poway, north of the city of San Diego, BBC reports.

The synagogue had been hosting a Passover celebration when the shooting took place, reports said.

Police have not suggested a motive but US President Donald Trump said the attack "looks like a hate crime".

The shooting comes six months after a gun attack killed 11 people at the Tree of Life synagogue in Pittsburgh. It was the worst anti-Semitic attack in recent US history.

San Diego County Sheriff Bill Gore told reporters that investigators were reviewing the suspect's social media activity and examining an open letter published online.

Authorities later named him as John Earnest, the Associated Press reported, and said he was also under investigation in connection with a fire at a mosque last month.

"During the shooting, four individuals were wounded and transported to Palomar hospital," Sheriff Gore said. "One succumbed to their wounds. The other three are in stable condition."

Mayor Steve Vaus said the rabbi had been shot in the hand.

"For this to happen only a week later at the end of the Passover, only a week after Easter is horrific," he told MSNBC.