Not really, all sensible areas are in the hands of the police. It takes max. 5 minutes until the first dozens of rioters are arrested. That happened several times in various cities, there has never been much damage. The security concept is working well. It could be a problem if Germany loses - because the fans outnumber the policemen - but it ain´t happen /joking.
"It could be a problem if Germany loses"
Way you're boys are going, that doesn't look likely.
Congrats on yesterday by the way. I did enjoy that (and won of couple of pints on it!).