killing up to fifty people. Refugee and migrant advocates condemned government policy as responsible for the tragedy, and ALP Party President Anna Bligh called for a complete review of ALP asylum seeker policy. Gillard returned early from holidays in response to the crash, and to review asylum seeker policy. Some months later Gillard would announce "The Malaysia Solution" in response. In April 2011 the federal government confirmed that a detention centre for single men will be built at the old army barracks at Pontville, 45 minutes north of Hobart. This immigration detention centre will house up to 400 refugees. Also in April 2011 immigration detainees at the Villawood detention centre rioted in protest of their treatment, setting fire to several buildings. Restoration of offshore processing In May 2011 Gillard announced that Australia and Malaysia were "finalising" an arrangement to exchange asylum seekers for processed refugees (the plan was dubbed the "Malaysia Solution"). Malaysia was not a signatory to the UN Refugee Convention, which Nauru has now moved to sign, but the government maintained that while it no longer believed that only signatories to the Convention were suitable, Nauru would not be feasible. Gillard and Immigration Minister Chris Bowen said they were close to signing a bilateral agreement which would result in 800 asylum seekers who arrive in Australia by boat being taken to Malaysia instead and Australia would take 4,000 people from Malaysia who had previously been assessed as refugees. On 31 August the High Court ruled that the agreement to transfer refugees from Australia to Malaysia was invalid, and ordered that it not proceed the on the basis that it contravened human rights protections established under existing laws. In an unusual attack on the judiciary, the Gillard questioned the consistency of Chief Justice Robert French as she faced political criticism over the rejection of the Malaysia Solution. She accused the court of missing an opportunity to "send a message" to asylum-seekers, sparking opposition charges she has breached the doctrine of the separation of powers. The government was unable to secure the support of the Greens or Opposition in the Senate for modifications to enable the Malaysia Solution to proceed and instead reverted to expanding onshore processing arrangements. Continued deaths at sea and ongoing boat arrivals kept the issue at the fore of policy debate during the term of the Gillard government, leading to a major Parliamentary debate on the