Great derby of Westphalia between teams of Preußen Münster and Arminia Bielefeld by both sides.
After 3:1, angry Bielefeld fans started to throw pyro. Referee stopped the match for a while.
SC Preußen Münster
Video from youtube https://www.youtube.com/watch?v=1YeyFWLgBgQ
Arminia Bielefeld
Photo source: turus.net