Cheng Xiaobing, chairman of state-owned China Telecom Corp., was detained has been detained for “severe disciplinary violations,” usually a reference to corruption allegations, The Wall Street Journal reported, citing a one-sentence statement posted to the website of the party’s Central Commission for Discipline Inspection. The detention comes amid intensifying scrutiny of top executives at China’s state-owned enterprises, with senior figures at major energy, automotive and banking firms detained this year. The probes have reached into China’s private sector as well, with conglomerate Fosun Group’s chairman, Guo Guangchang, disappearing earlier this month. Upon reappearing, Guo said he had been assisting authorities.