I sure hope not, but recent tensions in Europe dont bode well. :/

Depends what youre used to tbh.  Voted yes but nothing major...  More likely itll be a chain of stadium evacuations and delays for bomb scares or insert random terrorist reason.

The violence will probably involve the UK if it does happen ofc.  I would say the french but they cant even get their riots out of their high streets at the moment.

PS: Recent tensions in eurpoe?  What would they be?

Well, the behavior at recent matches with people throwing banana peels and making monkey sounds at black players would be one.

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Would be an ideal opportunity for BLiar to set up a "terrorist-related/blamed" incident.  Just think of the PR...

I dont think the Germans would play ball on that one though.  And rightly so.
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racial violence? - prob not much - though probably some racial chanting within stadiums

jingoistic violence between fans of different nations - probably a bit

I dont think there will be much. maybe a little as their team lose but you expect that.
This year should be good one. Most countries have done well to keep the trouble makers away.