The Reuters global sports blog
from Reuters Soccer Blog:
The fixture is widely regarded as the most fiery and dangerous derby in world football but despite the game almost being a title decider, the sting was taken out of the occasion by Red Star ultras refusing to turn up at Partizan's stadium.
Religious convictions had told them the game should not be played on Easter Saturday so they boycotted.
So there was no violence whatsoever, but that didn't stop a huge number of riot police being there.