By (AFP) Sydney – Myanmar's de facto leader Aung San Suu Kyi has immunity from prosecution, Australia's attorney general said Sunday after a legal bid was launched to hold her responsible for "crimes against humanity." A group of five Australian lawyers have filed a private application in the Melbourne Magistrates Court seeking to prosecute her over the treatment of the Muslim-minority Rohingya. It coincides with the Nobel laureate attending a special summit of Southeast Asian leaders in Sydney. Nearly 700,000 Rohingya have fled Myanmar's troubled Rakhine state for Bangladesh since authorities launched a brutal crackdown six months ago that the UN has called "ethnic cleansing." Myanmar has vehemently denied the allegations, insisting it was responding to attacks by Rohingya militants in late August. Attorney General Christian Porter said Suu Kyi cannot be prosecuted in Australia, nor arrested or detained. "Aung San Suu Kyi has complete immunity," he said in a statement. "This includes from being served with court documents because under customary international law, heads of state, heads of government and ministers of foreign affairs are immune from foreign criminal proceedings and are inviolable." Suu Kyi has come under intense global criticism for her public silence on the atrocities in Myanmar, which include claims of rape, murder and arson. The private prosecution alleges she committed crimes against humanity by the deportation and forcible transfer of the Rohingya people. One of the lawyers involved, Alison Battison, told the Sydney Morning Herald that Porter's decision was appealable. "The Attorney General is yet to respond to us, but when he does, we'll address that then," she said. "We wouldn't have done it if we didn't think we had a chance... it's a textbook example of crimes against humanity." Suu Kyi has not commented publicly since arriving in Australia on Saturday for the regional summit, but is scheduled to take questions at a media event on Tuesday. Malaysian Prime Minister Najib Razak ramped up pressure on her Saturday when he said the Rohingya issue could threaten regional security.