A disturbing little clip of Greek riot police all rushing to get a kick or hit in on a protestor who is already on the ground.
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It would seem to me that either the police were pissed off at being petrol bombed all day and decided to vent a little steam or they are trying to provoke a bigger reaction with the aim of getting medieval on the protestors. That their efforts are being filmed and distributed on Youtube will probably only add to the aggro on the ground.