Riot police fired volleys of tear gas, stun grenades and water 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.

A protest over the Greek government’s response to the nation’s largest ever train crash turned violent on Friday as Scores of youths hurled rocks and gasoline bombs at police.

Greek mass protests and a general strike Friday marking the second anniversary of a deadly train disaster morphed into violent Athens clashes between police and hundreds hooded, black-clad young protesters.