In 1867, members of the movement's leadership were arrested and convicted for organizing an armed uprising. While being transferred to prison, the police van in which they were being transported was intercepted and a police sergeant was shot in the rescue. A bolder rescue attempt of another Irish radical incarcerated in Clerkenwell Prison, was made in the same year: an explosion to demolish the prison wall killed 12 people and caused many injuries. The bombing enraged the British public, causing a panic over the Fenian threat.