The death brings the number of migrants found dead on both sides of the border to 11 since the crisis began
The body of a young Syrian man was found in a forest close to the border between Poland and Belarus, Polish police said on Saturday.
According to aid groups, the death brings the number of migrants found dead on both sides to 11 since the crisis began in the summer.
"The body of a young Syrian man was discovered yesterday in the forest near Wolka Terechowska," police said in a statement.
Police added that the cause of death could not be immediately determined.
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A group of around 100 migrants reportedly attempted to cross the border during the night in the same area.
"After seeing police and soldiers, the people on the Belarusian side fled into the forest," police said.
The Polish border guards also accused Belarusian forces of destroying some barbed wire fencing laid down by Polish forces overnight.
"They took down fence posts and tore up the barbed wire with a service vehicle. Polish forces were blinded by lasers and strobe lighting," a border guard said.
It also said that Belarusian forces supplied migrants with tear gas, which was used against Polish forces.
Thousands of migrants - most of them from the Middle East - have crossed or attempted to cross the European Union and NATO border since the summer.
The crisis escalated this week when hundreds of migrants began arriving at the border, attempting to get through.
Polish border guards estimate there are currently up to 4,000 migrants camped out along the border.
Western countries have accused the Belarusian regime of engineering the crisis in retaliation against EU sanctions, charges that the country denies.