Polish forces have used tear gas and water cannon against migrants trying to cross into the country from Belarus.
Videos showed migrants throwing stones and other objects at the Polish forces guarding a fortified border crossing.
For weeks, thousands of migrants, mostly from the Middle East, have been gathering at the Belarus border in an attempt to reach the European Union.
Belarus has been accused of pushing migrants to the border to try to destabilise the EU, a charge it denies.
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