More than 300 young people have been groomed and sexually exploited by gangs of men in Oxfordshire in the past 15 years, a damning report into the failures of police and social services to stop years of sexual torture, trafficking and rape will reveal, the Guardian has learned. The victims, mostly girls, come predominantly from the city of Oxford. A serious case review by the Oxfordshire safeguarding children's board, to be published on Tuesday, will condemn Thames Valley police for not believing the young girls, for treating them as if they had chosen to adopt the lifestyle, and for failing to act on repeated calls for help. Oxfordshire social services - which had responsibility for the girls' safety - will be equally damned for knowing they were being groomed and for failing to protect them despite compelling evidence they were in danger. One social worker told a trial that nine out of 10 of those responsible for the girls [were] aware of what was going on. The case echoes the child exploitation scandals in Rotherham, Rochdale and Derby. In Oxford, however, the grooming, sexual torture and trafficking took place on the streets of the Cowley area of the city, in churchyards, parks, a guesthouse and empty flats procured for the purpose of drugging the girls and handing them around to be gang raped and brutalised. Police officers and social workers did not listen to the girls when they spoke of the abuse they were suffering, did not believe them and dismissed them.