The investigation into Hu Haijun, who also serves as the Communist Party chief of his bureau, was announced by China's Central Commission for Discipline Inspection on Monday evening. The brief notice cited "serious violations of discipline and law" but provided no specific details. This development follows a gas explosion at the Liushenyu coal mine in Qinyuan county, Shanxi province, on May 24, 2026, which killed 82 workers, making it China's deadliest mining accident in years.