An anti-government protester makes Molotov cocktails during a protest at the Chinese University of Hong Kong, Hong Kong, China November 12, 2019.

A barricade set by protesters at the entrance to a campus is pictured at the Chinese University in Hong Kong, China, November 13, 2019.

Stones that protesters prepared to hurl at the police are pictured at the Chinese University in Hong Kong, China, November 13, 2019.

A baseball bat is pictured at the Chinese University in Hong Kong, China, November 13, 2019.

An anti-government protester uses a slingshot during a standoff with riot police at the Chinese University of Hong Kong, Hong Kong, China November 12, 2019.

Protesters practice a catapult with stones at the back of a barricade on a road leading to Hong Kong Baptist University, Hong Kong, China November 13, 2019.

A protester holds a javelin on a barricade at the Chinese University in Hong Kong, China, November 13, 2019.

Materials for Molotov cocktails are seen during a protest at the Chinese University of Hong Kong, Hong Kong, China November 12, 2019.

A protester holds a shield on a barricade at the Chinese University in Hong Kong, China, November 13, 2019.

A protester with a bow and arrow looks out for police on a barricade at the Chinese University in Hong Kong, China, November 13, 2019.

A protester walks at the occupied campus of the Chinese University in Hong Kong, China, November 13, 2019.

Stones are scattered on the road to prevent the police from getting to the campus of the Chinese University in Hong Kong, China, November 13, 2019.

Molotov cocktails are pictured at the campus of the Chinese University in Hong Kong, China, November 13, 2019.

Leaf blowers used to disperse tear gas are pictured on the barricade at the campus of the Chinese University in Hong Kong, China, November 13, 2019.

An aluminium tray used by protesters to smother tear gas canisters is pictured on a barricade at the Chinese University in Hong Kong, China, November 13, 2019.

An anti-government protester sits at a road block outside the occupied campus of the Baptist University of Hong Kong in Hong Kong, China, November 13, 2019.

Anti-government protesters gather at the Chinese University of Hong Kong campus in Hong Kong, China, November 13, 2019.

An anti-government protester makes Molotov cocktails during a protest at the Chinese University of Hong Kong, Hong Kong, China November 12, 2019.

A racket used for returning tear gas projectiles is pictured on a barricade at the Chinese University in Hong Kong, China, November 13, 2019.