LONDON (Reuters) -The British government said on Sunday it would ask the policing agency that investigates serious and organised crime to help track down more people suspected of being involved in grooming gangs that sexually abused thousands of girls. The scandal, in which gangs of mostly Pakistani men groomed and raped young white girls more than a decade ago, returned to the political agenda this year after U.S. billionaire Elon Musk criticised the British government. Under pressure to act, the government said on Sunday that the National Crime Agency would be asked to find more people who have escaped prosecution, building on the work of the police who have reopened over 800 historic cases.