The Manchester Martyrs – William Philip Allen, Michael Larkin, and Michael O'Brien – were members of the Irish Republican Brotherhood, an organisation dedicated to ending British rule in Ireland. They were executed for the murder of a police officer in Manchester, England, in 1867, during an incident that became known as the Manchester Outrages. The trio were members of a group of 30–40 Fenians who attacked a horse-drawn police van transporting two arrested leaders of the Brotherhood, Thomas J. Kelly and Timothy Deasy, to Belle Vue Gaol. Police Sergeant Charles Brett, travelling inside with the keys, was shot and killed as the attackers attempted to force the van open by blowing the lock. Kelly and Deasy were released after another prisoner in the van took the keys from Brett's body and passed them to the group outside through a ventilation grill; the pair were never recaptured, despite an extensive search. Source acknowledgement Wikipedia