China's internet regulator has fined several websites for violating internet publication rules and ordered them to "rectify" pages that ran news stories based on their own reporting, state media has reported.

Government rules restricting the publication online of "self-edited" news and information have been widely ignored, with many websites running robust reporting operations.

The enforcement of the rules appeared to be the latest move by President Xi Jinping's administration to strengthen the ruling Communist Party's grip on the flow of news and information.