Police and Crime Commissioner Mark Burns-Williamson says West Yorkshire Police have found documents which raise concerns into Sir Norman's role at the time he was Assistant Chief Constable of the force in 1998.
A report was commissioned into the background of a key witness due to appear before the inquiry when it sat in Bradford.
It comes after recent allegations that police officers tried to smear the family of race murder victim Stephen Lawrence prompting the Home Office ask police forces to review their involvement with the enquiry. Sir Norman's solicitor told ITV that he would not be commenting on the referral.
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