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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More than 80 prominent Britons, including Boris Johnson, Russell Brand and former Government ministers, urge Obama to release Aamer.
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Video shot in Islamic State capital Raqq purportedly shows at least two of three missing London schoolgirls.