A large crowd of angry residents confronted police officers in Missouri after an officer fatally shot a teenager who witnesses say was unarmed.
Police said Michael Brown, 18, physically assaulted the officer from the Ferguson police, who then fired multiple shots at Brown after he left the car on Saturday.
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Other entries in the UKTV channel Gold competition included jokes about Donald Trump, Brexit, Southern Rail and Ryanair UKTV channel Gold.
Temperatures will remain close to freezing.
The prime minister's announcement came as international leaders gather in Paris on the second anniversary of the climate change plan.