Police have set up a dragnet around the campus to try to arrest protesters, who typically try to melt away Online Cigarettes Store USA after blocking traffic or causing other disruption before police run in to grab as many as they can.
Other protesters blocked a major road not far from the Polytechnic campus in a bid to distract police and help those inside the campus escape.
They tossed paving stones onto stretches of Nathan Road as police chased them with tear gas.
An injured woman arrested at a Nathan Road intersection for participating in an unlawful assembly escaped Online Cigarettes Store USA after protesters stopped her ambulance and hurled rocks and bricks inside.
One police officer fired three warning shots, a statement on the police Facebook page said.
Police issued a “wanted” notice for the 20-year-old woman and said anyone who aided her could be charged with assisting an offender, which can be punished by up to 10 years in prison.
The road closure added to transport woes during the morning commute, with several train stations still closed because of damage by protesters last week and a section of one line closed completely near Polytechnic.
The Education Bureau announced that classes from kindergarten to high school would be suspended for Cheap Newport 100s cigarettes the sixth straight day Tuesday because of safety concerns. Most classes are expected to resume Wednesday, except for kindergarten and classes for the disabled, which are suspended until Sunday, the bureau said.