Using the "Supersemar" letter, Soeharto ordered the banning of PKI the following day and proceeded to purge pro-Soekarno elements from the parliament, the government and military, accusing them of being communist sympathisers. The army arrested 15 cabinet ministers and forced Soekarno to appoint a new cabinet consisting of Soeharto supporters. The army arrested pro-Soekarno and pro-communist members of the MPRS (parliament), and Soeharto replaced chiefs of the navy, air force, and the police force with his supporters, who then began an extensive purge within each service.