Football hooligans brawl on Berlin streets, up to 40 arrested (VIDEO)
At roughly 1pm local time a crowd of approximately 60 people engaged in the violence, a police spokesperson told rbb 24. Some media reports citing witnesses suggested that up to 200 people took part in the fighting.
Projectiles including beer bottles, stools and flares were thrown by several ultras during the fray.
Emergency services were quick to respond and dispersed the crowd quickly, making up to 40 arrests in the process, according to Bild.
Five people were treated by paramedics at the scene for injuries sustained during the skirmish, according to Der Tagesspiegel.
The rivalry is notoriously violent and security was already tight ahead of the evening game with increased police presence at the Berlin Olympiastadion. Alcohol-free beer is served at the event as a precaution to further limit the potential for violence at the derby.