This happens all the time in Brazil. There are buses of fans that goes to an away game, and if their bus gets broken down in "enemy territory", then there's trouble. My hometown has a stadium that'll have games from other teams for a cheaper fee, so we always have games from the region, and on the way back to the city, there has been some real crap going down, mostly fans getting beat up (20 fans on 5) and sometimes it leads to death.