The Rotherham sex abuse investigation will cost £90 million, it has emerged, as another grooming gang have been convicted of sexually abusing young teenage girls.

Operation Stovewood, overseen by the National Crime Agency (NCA), has 250 staff investigating child sexual exploitation in the South Yorkshire town from 1997 to 2013 and has identified more than 1,500 victims.

It is estimated that the Operation, which was set up in 2014, will cost more than £90 million by 2024, although few people expect it will be completed by then.

There are 22 separate investigations under Operation Stovewood, with one concluding today at Sheffield Crown Court after a gang of seven men were convicted on several counts of indecent assault.

Mohammed Imran Ali Akhtar, 37, Nabeel Kurshid, 35, Iqlak Yousaf, 34, Tanweer Ali, 37, Salah Ahmed El-Hakam, 39, and Asif Ali, 33 were all found guilty and are due to be sentenced on November 16.