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Two trains collided head-on in Greece, killing at least 36 people and dozens more injured late on Tuesday night.

It is being described as the worst train crash Greece has ever seen. The cause of the collision is not yet known.

The train had been travelling from Athens to the northern city of Thessaloniki, Greece's second largest city. Many of the 350 passengers on the train were students in their 20s on they way back from a long weekend celebrating Greek Orthodox Lent.

Reporter Alexia Kalaitzi spent the night in Thessaloniki talking to survivors.

(Pitcure: A general view of the site of a crash, where two trains collided, near the city of Lariss Credit: REUTERS/Alexandros Avramidis)