German police confirmed the incident.
In a statement, the group said it wanted to highlight that Germany is so far only seeing the “tip” of the climate catastrophe happening around the world.
It called on the government of German Chancellor Olaf Scholz to do more to tackle global warming.
The group has drawn attention and anger in recent months with direct actions including by blocking major roads and throwing food at famous paintings.
Criticising such protest, Scholz had called on the activists to instead show “a bit of creativity.”