Police in northern Belgium have found 12 men alive in a refrigerated truck at a motorway parking area after the driver alerted authorities.

A federal police spokeswoman said the driver, who was transporting fruit and vegetables, called police who found 12 migrants of Syrian and Sudanese origin.

They were taken to the immigration office in the city of Antwerp. The spokeswoman said all 12 were "in good health".

Last week, 39 migrants were found dead in a refrigerated truck in Britain after crossing from the Belgian port of Zeebrugge.

Belgian authorities are cooperating with the British investigation.