UPDATE: Intense clashes take place around the Polytechnic where anarchists tried to provoke the anti-riot police by burning the Greek flag.
Clashes have occurred around the University of Thessaloniki as well.
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Anarchists showed up on the roads around the Polytechnic in the Exarchia area in Athens and started seting up roadblocks a few minutes after 19:00′.
A few minutes later a barrage of Molotov petrol bombs were thrown on Sturnaris street.
Strong police anti-riot forces are on the site.