Los Angeles is under siege as rioters seize control of the 101 Freeway and ramp up violent clashes with the National Guard, LAPD and immigration officials in response to President Trump's efforts to track down and arrest illegal migrants.

Horrifying scenes of violence have stretched into a third day and sparked a political war of words between Trump and California Governor Gavin Newsom, who accused the federal administration of making matters worse with divisive rhetoric and threats.

The Los Angeles Police Department has been issuing a series of rapid fire directives as authorities seek to regain control of the rioters and contain the protests.

But on Sunday afternoon authorities revealed rioters had shut down the 101 Freeway both southbound and northbound after they stormed the road en masse.

Extraordinary vision shows at least 2,000 protesters as they commandeered both sides of the road, grinding traffic to a complete halt as they marched down the streets waving flags and holding signs high above their heads.