The group, made up of three Poles and three Belarusians, is accused of setting fire to two buildings.
The group, made up of three Poles and three Belarusians, is accused of setting fire to two buildings.
The 27-year-old man, who was last month convicted of arson in the Czech Republic, could face up to life imprisonment.
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The fire was probably caused by farmers illegally burning grass and exacerbated by recent dry weather.
Biebrza National Park in northeast Poland has appealed for donations to tackle the fire.