A citizen journalist who released a sex tape of a Communist Party official says there are more videos featuring at least five other senior figures, as public anger over abuse of power erupts online, local media reports.

The whistleblower Zhu Ruifeng said a police source had revealed the young woman in the video with the official, Lei Zhengfu, was hired by a property developer so Lei could be blackmailed, the South China Morning Post reported.

Caught in the act ... Lei Zhengfu was fired after an investigation. Credit:Screen grab

Screenshots from the sex video first appeared on Sina Corp's Weibo site on Tuesday. Net-savvy Chinese people have found a potent weapon for fighting official corruption and abuse of power in microblogs like Weibo, which had more than 420 million users at the end of the third quarter this year.

Mr Lei, a district party chief in the southwestern city of Chongqing, was fired after an investigation by the party's discipline watchdog confirmed that it was he who appeared in the video, the state-run Xinhua news agency said.