Police said Saturday that a van with 13 migrants hit the rear of the truck near the town of Demir Kapija late Friday and caught fire.
Ten migrants were Pakistanis and three were Bangladeshi. Four seriously injured migrants were transferred to clinics in the capital Skopje, while eight others are being treated at a hospital in the town of Kavadarci. The van driver ran away from the scene.
The migrants are believed to have entered illegally from Greece and to have paid smugglers to take them north through Serbia towards Europe's prosperous heartland.
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