BEIJING - Three senior officials of state-owned enterprises CNOOC, China Mobile and China Unicom are being investigated for allegedly accepting bribes in separate cases, the Supreme People's Procuratorate (SPP) said on Thursday.

The three are Wu Zhenfang, former deputy general manager of China National Offshore Oil Corporation (CNOOC), Zong Xinhua, former general manager of the informatization and e-commerce department of China Unicom, and Li Dachuan, former board director and deputy general manager of China Mobile's Beijing branch.

All three are charged with accepting bribes, and both Wu and Zong are now under "coercive measures," which includes summons by force, bail, residential surveillance, detention and arrest. The SPP did not specify what measures had been taken.