China has detained two more executives at China National Petroleum Corporation (CNPC) in a corruption probe, Caixin reported, citing unnamed sources. Authorities detained Bo Qilian, vice president of the listed subsidiary PetroChina (PTR.NYSE, 0857.HKG, 601857.SHA), together with his secretary, as early as May 13. Caixin also repoted that Zhang Benquan, general manager of CNPC’s Iran subsidiary, was put under investigation in early April. A sweeping corruption inquiry targeting the state-owned oil producer, China’s largest, started in August. The detentions indicate that the CNPC investigation has widened from the company’s domestic operations to overseas businesses.