A senior official from the State Administration of Foreign Exchange (Safe) not seen at work for two weeks is facing party disciplinary action for alleged corruption involving four other senior officials, according to a magazine report. The financial biweekly Caijing Magazine quoted sources close to the investigation as saying that Xu Mangang , head of Safe's supervision and inspection department, had been detained by the Party Commission for Discipline Inspection over possible links to the case of Guo Jingyi , the former deputy administrator of the commerce ministry's treaty and law department. Guo was put under shuanggui, a form of party investigation, in August over bribery allegations. Other figures to have been detained or arrested over Guo's case include Deng Zhan , a retired deputy administrator of the department of foreign investment, Liu Wei , a deputy chief for foreign investment registration at the State Administration for Industry and Commerce, and Du Baozhong , also a senior official at the commerce ministry's treaty and law department. Mr Xu, 42, was believed to have known and co-operated with the four suspects when they were arbitrators at the China International Economic and Trade Arbitration Commission, the report quoted the source as saying. Mr Xu, a Hebei native, graduated in 1989 with a degree in economic law from Renmin University of China's law school. He then joined Safe and worked through the ranks to become head of the supervision and inspection department in 2003.