By Martha Kelner, US correspondent
A shirtless man waving a Mexican flag stands atop a burning car in the heart of Los Angeles, as another man throws a traffic cone into the flames and some play drums and shout chants in opposition to immigration officials.
In the background, city hall can be glimpsed through a haze of thick black smoke.
The downtown district of one of America's biggest cities was a scene of pandemonium and lawlessness as protests, which had previously been mainly peaceful, turned ugly.
It was this chaos, his critics say, that Donald Trump wanted to provoke.
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