Tens of thousands of people marched in Athens and other Greek cities on Wednesday, March 8, in protest over a deadly train crash that killed at least 57 people near Tempe on February 28 and exposed major safety gaps within the country’s rail network.

The demonstrations were organized by labor unions and student organizations, according to Greek media reports.

This footage posted by PAME Greece International, a left-wing workers group, shows protesters marching, waving banners, and chanting in Athens.

At least 40,000 people were estimated to have taken part in protests in Athens, ERT reported.

Some violent clashes broke out between police forces and protesters near parliament in Athens and several people were also arrested, reports said.

On March 5, Prime Minister Kyriakos Mitsotakis apologized for the deadly collision, saying, “we cannot, will not, and must not hide behind human error. Credit: PAME Greece International via Storyful