I'm not sure if I understand what You mean.
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I ment in areas of the different supporters. Btw, I asked him today, he ment its just what he heard from polish guys (the guy has sth. like a Poland-mania...he may were on nearly every ground down to the 9th league may be.

The one with leag was so far he heard in the middle of the 90ies in Krakow, that with the burning happened between Zabrze and Gliwice. Anyway. Even that I think, that "sometimes knifing" is little bit euphemistic.

But so or so I'm against this things into football. Trouble is OK, but when people start to kill or wound eachother with weapons something moves into a wrong path...