An independent report says the force knew statements had been changed to protect senior officers from criticism of the way they policed the crowd.
96 Liverpool fans died during their team's FA cup semi final 23 years ago.
The police force criticised over Hillsborough claimed Nottingham Forest fans were urinating on police officers as they attempted to help.
The MP for Bassetlaw is calling for the removal of Sir Irvine Patnick's knighthood for his 'shameful' role in the Hillsborough scandal.
Details are emerging about the involvement of West Midlands Police in the cover up by emergency services after the Hillsborough disaster.