Six Irishmen were arrested within hours of the blasts, and in 1975 sentenced to life imprisonment for the bombings. The men—who became known as the Birmingham Six—maintained their innocence and insisted police had coerced them into signing false confessions through severe physical and psychological abuse. After 16 years in prison, and a lengthy campaign, their convictions were declared unsafe and unsatisfactory, and quashed by the Court of Appeal in 1991. The episode is seen as one of the worst miscarriages of justice in British legal history.