West Yorkshire Police said that the Crown Prosecution Service recommended charges following a joint probe with the city's returning officer into "voting patterns and postal votes". A police spokesman said: "We wish to emphasise in the strongest terms that Bradford Council, the returning officer and West Yorkshire Police have a firm policy of close liaison with regard to any allegations surrounding elections and are committed to ensuring that all elections are conducted fairly and impartially."
During the May 2005 election, former Bradford returning officer Philip Robinson referred 252 cases of possible election fraud to the police. In April 2006, West Yorkshire Police passed files on 11 men and two women to the CPS following its investigation in Bradford.