Parents of US teenager Michael Brown reject police apology

The parents of the unarmed black teenager gunned down by police in Ferguson in the US have rejected an apology by the city's top cop.

Michael Brown's mother, Lesley McSpadden, said Darren Wilson, the white officer who fired the gun, should instead be arrested.

The 18-year-old's death sparked days of widespread rioting.

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Walmart 'preparing for possible looting in Ferguson'

Images have emerged on Twitter purporting to show a barricade of trollies and water bottles at Walmart, after a state of emergency was declared in Ferguson, following nights of unrest over the shooting of an unarmed teenager.

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