Several protesters have been arrested as they tried to run from a Hong Kong university campus surrounded by police.
A group of around 100 people tried to leave Polytechnic University, but were met with tear gas and rubber bullets.
It is the third time protesters have tried to leave, following a violent and fiery overnight stand-off with police.
The university campus has turned into a battleground as the long-running Hong Kong protests become more violent.
As protests were raging, Hong Kong’s High Court ruled that a ban on protesters wearing face masks was unconstitutional.
In Beijing, Chinese foreign ministry spokesman Geng Shuang said at a news conference: “No-one should underestimate China’s will to safeguard its sovereignty and Hong Kong’s stability.”
Hong Kong is a part of China, and these protests are, in part, about the fear that the special freedoms Hong Kong enjoys as a former British colony are being eroded.