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.

By Edward McAllister ATHENS (Reuters) -Striking workers grounded flights and halted sea and train transport across Greece on Friday and people gathered for protests in anger over a perceived lack of justice two years after the country's worst-ever train crash killed 57 people.