Hungarian authorities say seven migrants were killed and four other people injured after the vehicle they were traveling in crashed into a house near the border with Serbia.
The incident took place late on December 13 in the southern village of Morahalom, when the driver of the car refused to stop for a police check and tried to escape at high speed, police said.
The vehicle, which had a Serbian license plate and was carrying 10 migrants, then crashed into a house and rolled over.
Those injured included the driver and three migrants.
Police said the driver was detained, and that proceedings against him would be launched for people trafficking and causing a fatal accident.
The so-called Balkan route to wealthier European Union countries is used by migrants and refugees escaping conflict, hardship, and persecution.
The number of migrants illegally entering the EU by crossing the Western Balkans has almost doubled this year, the bloc's border agency Frontex said in August, with the majority coming from Syria and Afghanistan.