Sun Luyi, 52, a deputy secretary-general of Shanghai's Municipal Party Committee, has joined the ranks of senior officials implicated in Shanghai's pension fund scandal, the South China Morning Post reported. A government spokesman announced Thursday that Sun had "seriously violated" discipline and was now assisting investigators. Although his rank in the local Communist Party is below the level of deputy secretary and standing committee member, Sun headed the party's main office and reported directly to party secretary, Chen Liangyu, who was stripped of his posts Monday. The head of Shanghai's Labour and Social Security Bureau, Zhu Junyi , who managed the pension fund was removed earlier as was Qin Yu, the head of Baoshan district and Chen's former secretary. A government source told the newspaper that the more heads may roll. "The entire leadership group might be changed. This is normal." The scandal is widely seen as an attempt by President Hu Jintao to bring Shanghai into line and weaken the powerful group of current and former leaders known as the "Shanghai Gang".