 Operation Withern was launched to investigate the cause of Mark Duggan's fatal shooting and the subsequent riots.According to a statement by the Metropolitan Police Service, Operation Withern was being led by Detective Superintendent John Sweeney of the Metropolitan Police Service, and is made up of detectives from the Homicide and Serious Crime Command, specialist investigators from the Public Order Branch and police support staff.The MP for Brent North, Barry Gardiner, said that community involvement there had so far prevented riots.