The mayor of Greece's second-largest city Thessaloniki has been treated in hospital after being beaten up by about a dozen people, officials say.
Yiannis Boutaris, 75, was kicked in the head and legs and beaten with bottles by a group of nationalists angry over his appearance at a remembrance event.
The mayor, who is known for his anti-nationalist views, was attending a ceremony to mark the killing of ethnic Greeks by Turks in World War One.
Politicians have condemned the attack.
A dozen people approached Mr Boutaris demanding he leave a flag-lowering ceremony in Thessaloniki on Saturday to mark what is known in Greece as the "Pontic Genocide", Thessaloniki city council president Calypso Goula said.
Ms Goula, who was also attending the event, described seeing several men throw bottles at Mr Boutaris and kicking the mayor in the head and legs after he had fallen down. Continue in BBC