Clashes between officials and migrants broke out, as police used tear gas to repel migrants and refugees who stormed the Macedonian border from Greece Monday, NBC News reported.
About 150-200 migrants and activists threw stones as police fired tear gas around midday. Frustrations have been rising over the restrictions imposed on people moving through the Balkans.
Macedonian police opened the border crossing to receive about 50 people just before noon, but closed it again after the clashes. A police spokeswoman said a train with 450 refugees left the Greek border early Monday and was heading for Serbia.
The Idomeni crossing in Greece is a key point on the mass migration route. About 6,500 Syrian and Iraqi refugees are camped out around the area.