A policeman in riot gear detains a protester outside of Hong Kong Polytechnic University as police storm the campus in Hong Kong, early Monday, Nov. 18, 2019.
Police prepare to fire on protestors at the Hong Kong Polytechnic University in Hong Kong, Nov. 17, 2019.

HONG KONG - Hundreds of Hong Kong student protesters who had barricaded themselves at a university attempted to flee the besieged campus early Monday, after an overnight standoff.

As the students made what appeared appeared to be a concerted effort to leave the campus of Hong Kong Polytechnic University, they were chased by police who fired tear gas. VOA saw police arrest dozens of students, who were detained with plastic wire ties around their wrists. Some were marched in front of reporters as they were taken away.

Map of Hong Kong University
Hong Kong University

Earlier police said they were arresting students on riot related charges.

It's not clear how many students remain on campus or how many have been arrested. The number of casualties also isn't clear. Police overnight had warned they would use lethal force if they continued to be attacked.

Student protesters in Hong Kong engaged in fierce clashes with police at a university campus early Monday in what appeared to be some of the worst violence since anti-government protests began five months ago.

Police prepare to fire on protestors at the Hong Kong Polytechnic University in Hong Kong, Sunday, Nov. 17, 2019. (AP Photo…
Police prepare to fire on protestors at the Hong Kong Polytechnic University in Hong Kong, Nov. 17, 2019.

Police advanced in waves throughout the night, firing tear gas and water cannons, as protesters lobbed petrol bombs and other weapons. At one point, an armored police vehicle appeared to be completely on fire.

Police eventually surrounded the campus and gave several deadlines for the protesters to exit the campus. Just after midnight local time, police warned they may use live rounds on protesters if they kept attacking the police.

There were no immediate reports of deaths. A group of international journalists, including some from VOA, stayed behind on the campus, with many vowing to stay until the situation was resolved.

Protesters are sprayed with blue liquid from water cannon during clashes with police outside Hong Kong Polytechnic University …
Protesters are sprayed with blue liquid from water cannon during clashes with police outside Hong Kong Polytechnic University (PolyU) in Hong Kong, China, November 17, 2019. REUTERS/Tyrone Siu

On the streets outside the campus, police also engaged in clashes with protesters, some of whom appeared to be trying to come to the rescue of the besieged students. Calls on social messaging sites issued calls for Hong Kongers to stream in from all directions to help free the students.

Since June, Hong Kong has seen massive, regular demonstrations, which started in opposition to a proposed bill that would have allowed Hong Kong citizens to be extradited to the mainland. The protests quickly morphed into wider calls for democracy and opposition to growing Chinese influence.

A smaller group of hardcore protesters, many of whom are college students, have also increasingly engaged in more aggressive tactics — clashing with police, destroying public infrastructure, and vandalizing symbols of state power. The students have defended the tactics as a necessary response to police violence and the government's refusal to accept their demands.

Riot police officers stand during clashes with protesters outside Hong Kong Polytechnic University (PolyU) in Hong Kong, China…
Riot police officers stand during clashes with protesters outside Hong Kong Polytechnic University (PolyU) in Hong Kong, China November 17, 2019. REUTERS/Adnan Abidi

Hong Kong Polytechnic University is one of at least five campuses where students this week barricaded themselves in, blocking roads and collecting makeshift weapons in case of an attack by authorities. Most of the protesters had left the other campuses by Saturday, though a group of hardcore protesters remained at Polytechnic.

The protests escalated in the past week, following the first death of a protester who fell from a building during clashes between protesters and police.

On Saturday, dozens of Chinese People’s Liberation Army soldiers helped clear protester barricades from a street, emerging from their barracks for the first time since the latest round of protests began.

Pro-democracy lawmakers immediately condemned the move as a violation of the Basic Law, Hong Kong’s mini constitution, which forbids interference by mainland Chinese soldiers unless formally requested by the Hong Kong government.