causing the disaster behind bars tonight. charged with negligent homicide. the prime minister also apologizing as protesters blame the government for decades of neglect. here s abc s lama hasan. reporter: anger erupting on the streets of the greek capital athens over the country s deadliest train crash last week. demonstrators clashing with police outside the parliament, hurling volleys of molotov cocktails. police responding with tear gas and stun grenades, trying to push them back. it began as a peaceful protest, 12,000 strong, with calls from students, rail workers and public sector employees marching and releasing black balloons to remember the 57 victims, demanding accountability for the crash. blamed on tragic human error, igniting nationwide outrage. a fringe group breaking away, making their frustration at the government heard. many in greece point the finger at the government for lack of funding and out of date equipment. tonight, the greek prime