captured armoured car to gain access to Mountjoy, but were discovered and had to shoot their way out. The Fenian poet, author of the popular song "Rising of the Moon", John Keegan 'Leo' Casey was imprisoned here during the 1860s; subsequently in the 20th century playwright and IRA activist Brendan Behan was also gaoled within. On 31 October 1973, it was the scene of a spectacular escape by a hijacked helicopter by three Provisional Irish Republican Army prisoners, including Seamus Twomey and J.B O'Hagan. By 2006, a 60-hectare site had been acquired for €30 million at Thornton Hall, Fingal, where a replacement for Mountjoy was to be constructed. The new facility was intended to accommodate 1,400 prisoners. The site was planned to include court facilities, video-conference links, medical and therapeutic facilities, but due to government cutbacks these plans have now been sidelined. Incidents In August 2006, prisoners who were normally separated from the rest of the population for safety were mixed together for a night with mentally ill inmate Stephen Egan. Prisoner Gary Douche was killed by Egan who was found not guilty of murder due to a lack of responsibility. This prompted the Minister of Justice to seek a limit of 520 inmates on the capacity of the prison. In October 2010, the prison was placed under lockdown after a night of violence and rioting involving more than 70 inmates. It started when a number of prisoners attacked three prison officers with pool cues and balls during recreation. Reinforcements were brought in from around Dublin to quell the riot and a number of Alsatians dogs from the riot unit were also deployed. In 2016, figures were released showing that Mountjoy Prison saw a disproportionate number of prisoners hospitalised due to assaults and self-harm. In response, the Irish Penal Reform Trust said the "ongoing levels of violence and intimidation in Irish prisons, particularly in Mountjoy Prison, must be addressed". Composition Main Prison Mountjoy Prison is constructed along a radial design with four main wings, A through D, each of which have three landings, as well as an underground basement landing. The wings are connected to a central circle, known simply as 'the circle'. When originally built in 1850 it had 500 cells each of which was designed for single capacity. Many parts of the original building have either been renovated or destroyed. At the time of the 2009 inspection, there