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Missouri tensions: Police fire tear gas in St Louis

14 August 2014 Last updated at 06:54 BST

There has been a fourth night of violence on the streets in Missouri after an unarmed black teenager was shot dead by police.

Crowds gathered in Ferguson, St Louis, over the death of 18-year-old Michael Brown.

Freelance Journalist Mariah Stewart told BBC News: "The protesters want to see change in St Louis."

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