Two years after the country’s deadliest rail disaster, many are still demanding greater safety and accountability.

Riot police fired volleys of tear gas, stun grenades and water canon at protesters hurling gasoline bombs and smashed-up paving stones in Athens during mass demonstrations Friday to mark the second anniversary of a devastating train crash that has become a symbol of institutional failure in Greece.

The protests were supported by demonstrations at more than 100 Greek embassies and consulates internationally, across all six inhabited continents.