Hong Kong: University campus turns into battleground

Protesters stand in a supply room at Hong Kong Polytechnic University, the last campus to hold out in a week of violent protests in Hong Kong. As the number of protesters dwindled to around 100 on Tuesday, demonstrators said food and other supplies were running low.

A riot police officer fires tear gas at anti-government protesters. In a dramatic moment, officers fired tear gas at protesters as they escaped down a rope descending from a footbridge.

A protester holds a burning molotov cocktail during protests. Protesters assaulted police trying to enter the campus with the homemade explosives as well as arrows and bricks.

A demonstrator sports a face-concealing mask. On Monday, the Hong Kong High Court ruled that the mask ban enacted over a month ago was unconstitutional. On Tuesday, a Chinese state media outlet condemned the decision to veto the ban and said that only China has the authority to rule on constitutional matters in Hong Kong.

A protester tries to escape through a sewage tunnel. Around a dozen protesters tried to escape the university protests through the sewage system, but we're forced to turn back.

US Secretary of State Mike Pompeo said the US was "gravely concerned" about recent developments in Hong Kong. He stressed that the US believes the government in Hong Kong is responsible for restoring peace.

Young people go through a security control point set up at Hong Kong Polytechnic University on Tuesday morning. A group of parents and pastors called for police to let the students leave. They claimed that many were peaceful protesters who were stuck in campus for fear of being arrested for rioting.

Emergency service workers remove a man from the campus. More than 200 people have been injured in two days of violent clashes