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CALGARY • A corruption probe in China is reaching deeper into PetroChina’s operations in Canada’s oil industry, with four high-ranking company officials involved in oil sands deals now believed to be under investigation.

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Zhiming Li, the PetroChina executive who until recently was responsible for the Chinese company’s operations in Canada, has been arrested in China, according to a report from Beijing





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Reports in China link Margaret Jia, until recently the general manager of CNPC International (Canada) in Calgary, to the investigation, which focuses on the Chinese oil giant’s purchase of oil sands leases at what are believed to be inflated prices.

Ms. Jia’s whereabouts are unknown. One report in China’s Want China Times says she has been arrested.

Ms. Jia, whose Chinese name is Xiaoxia Jia , is the sister-in-law of Yongkang Zhou, China’s retired national security chief who is the highest-ranking casualty of President Xi Jinping’s campaign against corruption and a main focus of the probe.