ATHENS - At least five people were killed and two seriously injured on Friday when a small van carrying Iraqi and Syrian migrants smashed into a wall and overturned on a northern Greek motorway, police said. Police said three children and a person identified as a 'trafficker' who was driving were among the dead in the early morning crash as the vehicle headed to the city of Thessaloniki. 'Police were alerted by passers-by,' a police spokesman said. The minivan had Polish registration numbers, he added. The nationality of the driver was not immediately clear. Greece has been a gateway for hundreds of thousands of refugees fleeing violence in Iraq and Syria for Europe.