But he added that investigations are still ongoing.
But he added that investigations are still ongoing.
Police are investigating the cause of the fire amid claims that it could have been deliberately started.
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Over 400 firefighters from 107 units were involved in putting out the blaze.
The incident led to the shutdown of more than a dozen escape rooms in Poland.
The vehicle was parked outside a hospital in Warsaw.
The fire was made worse by the modern construction of the newly built archives.
The telecoms industry says that such acts of vandalism are on the rise.
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.