Asylum seekers and foreign nationals are involved in a 'significant proportion' of ongoing police investigations into grooming gangs, an official report has warned.

The long-awaited review by Whitehall troubleshooter Louise Casey was released yesterday after being commissioned at the start of the year.

It found that councils, police forces and the Home Office repeatedly 'shied away' from dealing with 'uncomfortable' questions about the ethnicity of rapists preying on thousands of vulnerable girls.

Baroness Casey last night hit out at 'do-gooders' who tried to bury the facts of such cases, yet only ended up giving racists 'more ammunition'.

Despite years of warnings, she said, the quality of data collected at a national level remained 'woeful and a dereliction of public duty'.