A British news photographer has undergone emergency surgery after being hit by a non-lethal bullet while documenting the stand-off between police and protesters in the US city of Los Angeles.

Nick Stern was covering the protests against Immigration and Customs Enforcement (Ice) when he said a 14mm "sponge bullet" tore into his thigh.

"Some of the protesters came and helped me, and they ended up carrying me, and I noticed that there was blood pouring down my leg," he said.

Demonstrations against immigration raids have been raging in LA for three days, with protests on Sunday erupting outside a Home Depot store in Paramount, south of LA.

Stern, who relocated to the US in 2007, told PA he was treated by a medic who urged him to go to hospital, adding that at one point he passed out from the pain.