Hong Kong: Groups of China supporters have pulled down "Lennon Walls" of anti-government protest messages across Hong Kong, raising the possibility of clashes with democracy supporters and another weekend of trouble.

By mid-morning Saturday, dozens of Beijing supporters had started to tear down the large mosaics of colourful notes calling for democracy and denouncing perceived Chinese meddling in the former British colony.

A pro-China supporter cleans up a Lennon walls of anti-government posters and memo notes outside Yeun Long MTR station on Saturday. Credit:Getty Images

The installations have blossomed across the Asian financial centre, at bus stops and shopping centres, under footbridges and along pedestrian walkways.

They have also occasionally become hot spots of violence in the city's three months of unrest.