The government has ordered outside auditors to examine allegations that an east London mayor sought to shore up his vote by diverting £2m in public grants to Bangladeshi and Somali groups.
The communities secretary, Eric Pickles, said staff from the accountancy firm PricewaterhouseCoopers were already in place at Tower Hamlets council. A file is being passed to the Metropolitan police.
This week a BBC Panorama documentary alleged that the executive mayor of Tower Hamlets, Lutfur Rahman, increased taxpayer funding to Bangladeshi and Somali groups from £1.5m to £3.6m against council officer recommendations, cutting what was available for other organisations by 25% overall.
Rahman, who is of Bangladeshi origin, has denied the allegations,accusing the BBC of racism and Islamophobia. He sits as an independent after he was dropped by Labour in 2010.
Pickles said: “It is a matter of public record that I have long been concerned about a worrying pattern of divisive community politics and alleged mismanagement of public money by the mayoral administration in Tower Hamlets. Following the receipt of a number of documents, I am now taking legal steps, in the public interest, to appoint inspectors to look into the allegations.