Alleged context (feel free to correct if you have info in comments):

After Israeli Maccabi hooligans terrorized Amsterdam, the Dutch government demonized the pro-Palestine movement and banned protests. People came to protest anyways (peacefully)

The police arrested peaceful protesters and put them in a bus. They were driven to a parking lot. The police released them from the bus in a parking lot near a station.

While the protesters were walking to the station the police started hitting them. Allegedly for not moving fast enough.