Hong Kong’s airport canceled more than 100 flights on Monday afternoon after thousands of demonstrators flooded the transportation hub, one of the world’s busiest, in a show of anger over the police’s response to protests the night before.

The cancellation of well over 100 flights, including many departing after 6 p.m. was a stark display of the power of the protests to disrupt the basic functioning of the Asian financial hub. The airport is a crucial connection point for air travel around Asia.

The protesters gathered throughout the day, eventually filling the arrivals hall, before more protesters went upstairs to the departures hall.

The protest came after a night in which the police fired tear gas inside a subway station and charged at protesters on an escalator in another station. Many protesters were angry that a female demonstrator was hit by a projectile in her eye.