Armenians in northern Greece staged a protest near a Turkish consulate on Wednesday evening (April 24) but were blocked by riot police.
Video shows protesters kicking out and shouting at riot police in highly charged scenes outside the consulate in Greece's second city, Thessaloniki.
Earlier, members of the Armenian community marched peacefully through the city waving the national flag.
Armenians worldwide commemorated yesterday the 104th anniversary of the Armenian Genocide, the Ottoman government's systematic extermination of around 1.5 million ethnic Armenians.
Turkey contends that the deaths starting in 1915 were due to civil war and unrest.