China will prosecute a former high ranking official in its secret police for suspected bribery, the state prosecutor said on Monday, taking a step that will almost certainly result in a conviction.

Ma Jian, once a vice minister at China's Ministry of State Security, is the most senior security official to be investigated since former domestic security tsar Zhou Yongkang was ensnared in a graft scandal and jailed for life in 2015.

Ma, who was put under investigation in January 2015, was expelled from the party in December after it accused him of abuse of power, taking bribes and interfering in unspecified law enforcement activities.