Athens police detained 16 persons and arrested seven during clashes in downtown Athens after the rally to mark the November 17 anniversary.
The clashes, which resulted in police officers and citizens being injured, broke out after the end of the protest march marking the 41st anniversary of the Athens Polytechnic uprising at around 20.30, when unknown individuals set garbage bins on fire and starting throwing stones at the police officers. Clashes de-escalated but tension flared again two hours later around Stournari street, close to the Technical School of Athens (Polytechnic) in the district of Exarhia.
Police used tear gas to disperse protesters who threw petrol bombs at them.
In the northern Greek city of Thessaloniki, police arrested two during the events to mark the Polytechnic anniversary. Another seven persons were detained but were later released.