A group of "around 90" fans were denied passage to the city after it was deemed they were not travelling peacefully
Police stopped a contingent of Borussia Dortmund fans from attending Saturday's Bundesliga match against Darmstadt.
Authorities seized pyrotechnics, balaclavas, combat gear and drugs after stopping two buses transporting Dortmund supporters to Jonathan-Heimes-Stadion am Bollenfalltor.
The police stated that "around 90" fans had consequently been escorted back to North-Rhine Westphalia.
In a post on Twitter, Dortmund revealed they had been in contact with law enforcement regarding the issue.
A police statement read: "After the buses were located in the morning near Giessen, a check took place immediately.