According to the procuratorate, Sun has been placed under "coercive measures", which may include summons by force, bail, residential surveillance, detention and arrest. The investigation is underway, the procuratorate said in a statement released on Monday. In July, the CPC Central Commission for Discipline Inspection launched an investigation into Sun for "serious violations of Party discipline". He was found by the CCDI to have leaked confidential Party information and seriously breached Party rules on integrity. In September, the Political Bureau of the CPC Central Committee expelled Sun from the Party and dismissed him from public office.