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	President Barack Obama and the family of late 18-year-old Michael Brown separately appealed for calm after a prosecutor said a grand jury had found the policeman acted in self-defence.</div>
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	St Louis County Prosecuting Attorney Robert McCulloch said Officer Darren Wilson had fired 12 times after getting into an &quot;altercation&quot; with Brown, and that the jury had found no grounds to file charges.</div>
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	As McCulloch rounded off his summary of the grand jury testimony, Brown&#39;s mother burst into tears and the crowd began to chant: &quot;Hey, hey, ho, ho! These killer cops have got to go.&quot;</div>
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	Members of an angry crowd outside the police station where Wilson had been based threw bottles and stones. A police car was set alight and stores looted.</div>
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	Riot officers responded with teargas and flash grenades, and running battles broke out in the streets of the St Louis suburb.&nbsp;</div>
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	Looters smashed their way into a mobile phone store opposite the police headquarters and ransacked it. Nearby, an AFP journalist was hurt when he was hit in the face by a hurled object.</div>
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Riot after US jury fails to indict Ferguson policeman

FERGUSON, United States (AFP) - Violent protests and looting erupted in the US town of Ferguson on Monday after a grand jury chose not to press charges against a white officer who shot dead a black teen.