Three people died at the Polish-Belarusian border on Saturday, while a fourth died on Sunday, Polish border guards confirmed. They had all frozen to death, they added.
The migrants crossed from Belarus into Poland, but they have now been stuck at the border for 42 days.
Barbed wire currently prevents migrants from returning to Belarus, and wires also separate them from Poland, preventing them from entering the EU, according to Euractiv.com.
According to the Polish authorities the situation is a security threat. Poland introduced a state of emergency at the border region.
