Poland has accused Belarus of creating a major incident on the border between the two countries by encouraging migrants to try to force their way across.
The Polish government says there are currently between 3,000 and 4,000 people at the border with thousands more ready to follow them.
12,000 Polish troops have been deployed to protect the razor-wire fence along the border.
The European Union says Belarus is deliberately creating the migrant crisis on its borders in retaliation for Western sanctions.
Sophie Raworth presents BBC News at Ten reporting by Nick Beake at the the Polish/Belarusian border.
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