Opposition figures yesterday unleashed unprecedented criticism of Mr Suharto's 32-year rule, warning that tough decisions were urgently needed to avert revolution. Influential Muslim leader Amien Rais and charismatic opposition figure Megawati Sukarnoputri, speaking to cheering crowds, condemned the killing of six students. 'They have been killed like dogs . . . this is a crime against humanity,' said Mr Rais, chairman of the 28-million-strong Mahammadiyah social and education organisation. Roars of 'resign, resign' were directed at the President by the 5,000 students gathered at the Trisakti University to mourn their fallen colleagues. Mr Suharto's vast military machine had two choices, Mr Rais said. 'The first is to defend the Suharto family. The second is to defend the Indonesian people. The Army wear uniforms bought by the people. They must defend the people.' Ms Megawati urged students to keep up a peaceful struggle for reform in her fiery address. 'Keep your spirits for a long battle. Reform must happen,' she said. Other rarely seen figures urged the students on, including Supeni, an ally of former president Sukarno, and former Jakarta governor Ali Sadikin. Students frequently needed to be calmed as they rose to abuse passing trucks of riot police and military units that kept an otherwise low profile. Afterwards Mr Rais, who recently gave Mr Suharto's new Cabinet six months to prove itself, told the Post the President should resign to avoid revolution. 'Enough is enough. The armed forces must not be allowed to rule by terror,' he said.