Polish demonstrators have blocked the path of lorries with Russian and Belarusian number plates trying to cross into Belarus, according to a report by broadcaster TVN24.
The action led to a traffic jam stretching 10km at the Koroszczyn border crossing.
Many of the protesters waved Ukrainian flags, indicating their support for that country which came under Russian attack on February 24.
Some of the attacking troops started the assault from Belarusian territory.
The truckers caught in the action protested that the war had nothing to do with them.
"The war doesn't interest us. We just want to travel on," said one trucker caught at the border.
Separately, another group of protesters gathered in front of government buildings in central Poland to demand that the country's borders be sealed to lorries from Belarus and Russia.
A Polish government spokesperson said there has been no European Union decision on blocking lorry traffic between the bloc and Russia although he said Poland was looking into legal options for limiting this flow of trade, according to a report by the Polish news agency PAP.
He also said any lorries crossing the border that originated in Belarus or Poland are inspected to make sure there are no violations of the sanctions imposed on the country after Russia's invasion.
Australian Associated Press
