prisoners withdrew to the exercise yard, taking six hostages, as flames quickly overran the building, spread into the rafters, and caused the roof to collapse. Police negotiators communicated with the ring leaders, and by nightfall only five hostages remained. Meanwhile, the fire brigade had trouble bringing the inferno in the main cell block under control, as the prison's gate was too narrow for their trucks, and prisoners impeded their endeavours by throwing debris at them. The prisoners' leaders made three demands: a meeting with Attorney General Joe Berinson, access to the media, and a guarantee of no retribution afterwards. The next morning, after 19 hours, the hostages were released, even though only the third demand had been met. Prisoners did, however, have an opportunity to communicate with the press during the siege, as the riot was a live media event with television helicopters filming from overhead. Although there were no deaths, the fire caused $1.8 million of damage, and officers were injured. In the aftermath of the riot, there was extensive media attention on Fremantle Prison, and investigative journalists uncovered prior warnings to the prison authorities of the risk of such an event. The government hastily initiated an enquiry into the incident, and a report was completed within six weeks. A trial involving thirty-three prisoners charged over the riot was also held, the largest in the state's history, which resulted in lengthened sentences for the prisoners. Conservation Heritage listing Fremantle Prison was listed in the Western Australian Register of Historic Places as an interim entry on 10 January 1992 and included as a permanent entry on 30 June 1995. Described as the best preserved convict-built prison in the country, it became the first building in Western Australia to be listed on the Australian National Heritage List, in 2005. The Australian Federal Heritage Minister, Senator Ian Campbell, stated that it would be included in a nomination of eleven convict areas to become World Heritage Sites. Five years later, these locations were inscribed on the UNESCO World Heritage List in 2010 as the Australian Convict Sites. The process of obtaining World Heritage listing focused historical interpretation and conservation efforts on the prison's convict era. This came at the expense of its more recent history, included use as an internment centre during World War II, and the imprisonment of Aboriginal prisoners. The prioritisation, evident from the first conservation plans from before the prison