Several protesters have been arrested while trying 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.
In the past week, the campus has turned into a battleground as long-running anti-government protests become more violent.
Meanwhile, Hong Kong's High Court ruled that a ban on protesters wearing face masks was unconstitutional. The colonial-era emergency law was invoked in October, but protesters largely defied the ban.
The violence is some of the worst seen during months of unrest in the semi-autonomous Chinese territory.
The protests started over a controversial extradition bill, and have now evolved into broader anti-government demonstrations.
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