Two more officials with the National Energy Administration (NEA) are under investigation for bribe-taking, China's prosecuting authorities announced on Friday.

The officials are Xu Yongsheng, NEA deputy director, and Wang Jun, head of the organization's renewable energy department.

According to a statement, "compulsory measures" have been taken against Xu and Wang, and they are under investigation.

Prosecutors put Hao Weiping, head of the NEA's nuclear power department, and Wei Pengyuan, vice director of the administration's coal department under investigation on Wednesday, also on charges of bribe-taking.