Beijing, Jan 20 (IANS): A senior Communist Party school official in northwest China's Shaanxi province has been dismissed from his post and expelled from the party over a sex scandal, a local anti-graft agency said Monday.

The punishment came after an official investigation into Qin Guogang, vice-president of the party school of the Shaanxi committee of the Communist Party of China, over allegations of a sexual relationship with a female post-graduate in the school, Xinhua reported.

The CPC's Shaanxi provincial disciplinary commission gave no further details.

Qin was embroiled in a sex scandal after photos of a naked man resembling him appeared online last Monday.

According to posts in cyberspace, he maintained sexual relations with the post-graduate for more than a year with the promise of marrying her, only for he and his wife to later beat the student in a school office.

The photos were stills from a video shot Aug 13, 2013, in the residence of the post-graduate, according to Qu Jianguo, the woman's lawyer.