First they tried storming their parliament building, left 3 dead.
http://www.zerohedge.com/article/greek-attempt-storm-parliament-rebuffed-3-people-dead-greek-bank-fire
Now they set fire to a branch of their finance ministry
http://imarketnews.com/node/12929
More report from the BBC
http://news.bbc.co.uk/2/hi/europe/8661385.stm