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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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Federal investigation opened into Michael Brown death

The US Justice Department has opened a separate, federal, civil rights investigation into the death of Michael Brown, President Obama said. .

He said: "They are on the ground and along with the FBI they are devoting substantial resources to that investigation."

He added: "The US Attorney General will travel to meet with the FBI agents conducting the federal criminal investigation."

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