Riot police on the streets of Athens appear to have had red paint thrown at them.
In the video below, some of the riot police can be seen wiping their visors clean standing next to a large splatter of paint on the road.
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The Police Federation chairman said officers were often "letting someone off with a warning and hoping for the best".
A total of 21 are also injured by a blaze which ripped through the upmarket 22-storey hotel on the Black Sea coast.