Child sex grooming gangs have avoided prosecution due to a failure by one of the country's biggest police forces to pursue claims against them. Greater Manchester police (GMP), the third largest force in England and Wales, has been accused by serving and former detectives of attempting to cover up failings to tackle gangs of Asian men who were abusing young girls. Responding to the claims, GMP chief constable Sir Peter Fahy [said] that officers had developed a mindset" that victims in sexual abuse cases were "unreliable" but, while this had since changed, it was still present within the courts. The claims against GMP come just months after a damning report found at least 1,400 children were subjected to sexual exploitation in Rotherham between 1997 and 2013, with "blatant" collective failings by the council and South Yorkshire police blamed for the abuse. Another GMP detective, who has remained anonymous ... revealed there was reluctance by senior officers to investigate sexual abuse claims despite her warnings the problem was spiralling out of control. In a letter seen by ITV News, one serving officer claims there has been a "cover-up" and an internal report commissioned two years ago has been "re-written on nine separate occasions". A statement from the police force said: "Considerable resources are now invested in a number of ongoing investigations and we have already made clear that further arrests will be made.