Shocking video has shown how violent riots plunged Los Angeles into chaos, with a van seen ploughing into crowds, protesters torching cars and throwing rocks at cops, and journalists shot with rubber bullets as authorities staged a brutal crackdown.

Horrifying footage filmed by motorists showed people running for their lives as a people carrier was driven full-speed into a crowd, with reports that several protesters were injured.

The driver of the vehicle - reported to be shirtless as he launched the attack - spun it around in circles and reversed it multiple times in an apparent attempt to hit people, and was later arrested.

Clashes erupted between law enforcement and protesters following immigration raids across the US, with Donald Trump responding to the violence by ordering the deployment of the National Guard.

Rioters were filmed driving motorcycles at cops and blockading streets, with the carnage grinding Downtown LA to a complete halt as authorities declared an 'unlawful assembly' in the area.