Police ordered the public to disperse from downtown Los Angeles after further unrest, with cars torched and security forces firing tear gas at protesters, in the wake of Donald Trump's deployment of National Guard troops to America's second-biggest city.

Protests in Los Angeles, home to a large Latino population, broke out on Friday, triggered by immigration raids that resulted in dozens of arrests of what authorities say are illegal migrants and gang members.

Critics say the US president -- who has made clamping down on illegal migration a key pillar of his second term -- was deliberately stoking tensions with his deployment of California's National Guard, a stand-by military usually controlled by the state governor.

Demonstrators told AFP the purpose of the troops did not appear to be

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