1974, the IRA exploded two bombs in Birmingham pubs which killed 21 people. 6 Irish men were arrested despite the IRA claiming none of them were involved. After interregation, 4 signed confessions and forensic evidence suggested they had handled the bombs. They recieved long prison sentences until in March 1991, new forensic evidence revealed the scientists were unreliable and the men were released. This lead to concerns and doubts of the legitimacy of the police and treatment towards suspects.