What happened is a demonstration of hundreds of residents of Kalamaria (a large suburb of Thessaloniki by the sea) and Thessaloniki on the seafront of Kalamaria. There, privatization works fence the one open area after the other, so, after a decision of a residents assembly, the demonstrators tore down the fencing bars of the local marina that prevent free access to the seaside. This action was welcomed with applause from local people.
Texts in greek and a lot of photos can be found here:
http://indy.gr/ or here http://athens.indymedia.org/ or there: http://diexodos.blogspot.com/.