The Polytechnic University stand-off is one of the more dramatic episodes in six months of unrest that began in June with protests over an extradition bill seen by many in Hong Kong as an erosion of freedoms.
City leader Carrie Lam said 600 people had left the Hong Kong Polytechnic campus, including 200 who are under 18-years-old.
Police stormed the campus after an all-night siege that included firing repeated barrages of tear gas and water cannons.
Police have used tear gas to force hundreds of protesters, some lobbing petrol bombs, to retreat behind make-shift fortifications at the Hong Kong Polytechnic University.
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