Following hours of peaceful mass rallies in the Greek capital to mark two years since the Tempe rail disaster, youths with hammers smashed paving stones, throwing the rubble and makeshift firebombs at police.
Police in Athens have fired tear gas at demonstrators hurling rocks and petrol bombs during clashes outside Greece’s Parliament on the second anniversary of a train crash that killed 57 people.
Yannis Panagopoulos, president of the General Confederation of Greek Workers, the country's largest union, said: "The full truth must come to light, and those responsible, no matter how high their position, must be held accountable.
Private businesses and public services have also been affected, with many stores in Athens closed, leaving messages of solidarity for the victims' families in front windows.
The disaster on February 28, 2023 in Tempe - where a passenger train collided head-on with an oncoming freight train - was Greece's worst railway accident.