Chinese authorities have arrested former domestic security chief Zhou Yongkang and expelled him from the ruling Communist Party, accusing him of crimes ranging from accepting bribes to leaking state secrets, the official Xinhua news agency said on Saturday.

In a statement released by Xinhua at midnight, the party’s elite decision-making politburo said that Zhou’s case had been handed over to judicial authorities, setting the stage for his trial.

Zhou, 71, is by far the highest-profile figure caught up in President Xi Jinping’s crackdown on corruption. He is the most senior Chinese official to be ensnared in a graft scandal since the party swept to power in 1949.