ZAGREB (Reuters) - Four migrants died and 10 were severely injured in a traffic accident of a truck on a highway in eastern Croatia, state news agency Hina said on Monday citing police sources. The driver of the truck, a Serbian citizen, lost control and the vehicle turned over with 24 migrants hidden inside among rolls of paper, it said. The migrants did not have any identification documents, the news agency added. The head of the hospital in Nova Gradiska, where the injured were taken in the early morning hours on Monday, said that they identified themselves as Syrian citizens, Hina said. Croatia is on the Balkan migrant route where many illegal migrants coming from the Middle East or Africa, often victims of human trafficking, try to reach more affluent European Union countries.