Do Thang Hai, 60, was held as part of an investigation into alleged wrongdoing at an oil trading firm in southern Vietnam, the police-run ministry of public security said in a statement.

Hai is the latest among hundreds of Vietnamese officials investigated for corruption, many forced to quit, including former president and premier Nguyen Xuan Phuc and two deputy prime ministers.

Hai’s home and his office were searched today, the state-run Tuoi Tre newspaper reported, citing police. The trade ministry did not immediately respond to a Reuters request for comment.

Hai, a deputy minister since 2014, has been in charge of areas such as the domestic market, trade promotion, manufacturing, and international cooperation, and has also been a ministry spokesman.

The anti-graft campaign, dubbed “blazing furnace”, has reached deep into Vietnam’s corporate sector too, with tycoons, top stockbrokers, property developers, and even regulators ensnared, last year triggering a US$40 billion wipeout for stocks and rattling investor confidence.

Police have in recent weeks detained four others for their involvement in the case at Xuyen Viet Oil Travel and Transport Trading Co. Those include the Communist Party’s top official in Ben Tre province and the head of the finance department of Ho Chi Minh City, Vietnam’s business hub, according to the police statement.

Calls by Reuters to Xuyen Viet, headquartered in Ho Chi Minh City, went unanswered.

The city’s police department today, in a separate statement, said Xuyen Viet had an outstanding tax debt of US$62.91 million as of August 2023.