Police and social workers failed to tackle the issue of Asian men grooming under-age white girls for up to a decade, the Daily Telegraph can reveal.

The mother of a girl who gave evidence in the trial of nine Asian men convicted of child sex offences has shown this newspaper evidence that suggests the authorities were aware of the abuse as long ago as 2002.

An official report by a sexual health adviser, which was passed on to social workers and police in 2005, detailed the kidnap and rape of an underage girl in Rochdale, where the gang was operating, but the authorities failed to act.

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