Most likely related to this:

Berlin police have turned a neighborhood known for its Arab population into a heavily restricted area, closing parts of it and prohibiting any kind of protests against the Israeli genocide in Gaza.

In German news they say its more like 400 arrested, and there was the little fact that police presence was higher than normal. More police equal more arrestings.

Last year was a lot worse. The police direktor said they were prepared a lot better this year and injuries amongst police and fire department were minor. People buy illegal fireworks in Poland like firework shells and light them on the streets without the mortar tubes. Looks pretty apocalyptic.