A Hong Kong media outlet has reported that a rare political protest took place in Beijing despite heavy security in the run-up to the Chinese Communist Party's National Congress.

The article said at least one person hung banners on an overpass in the capital on Thursday with messages such as, "We don't need the Cultural Revolution. We need reform," and "We don't need PCR tests. We need meals."

The report says flames and smoke broke out at the site. An NHK crew visited the location on Thursday afternoon and discovered a mark suggesting a fire had been put out.

The article is believed to have been removed as it can no longer be found online.

The congress, which takes place every five years, begins on Sunday. Analysts say that President Xi Jinping is certain to secure a rare third term as the party's top leader.