Four people were killed, including three Serb tourists heading to Pieria on holiday and one Albanian man, in a car crash on the Athens-Evzones highway near the Kilkis wetlands and the border of the FYROM on Monday.

The accident occurred at around 11:00 a.m. when the car driven by a Serb family, comprising of a man and a woman, their 11-year-old son and the woman's father, collided head-on with a car driven by an Albanian national.

The crash resulted in the deaths of the woman, her father, the young boy and the Albanian man in the second car. The Serb driver of the first car was injured and rushed to hospital.

So far, the cause of the accident remains unknown and is being investigated by the Polykastro traffic police. The names of those killed had not been released late on Monday afternoon.