Road blocks were in place across the southern Polish region, while around 40 officers and forensic experts were mobilised to gather evidence at the camp itself, said regional police spokesman Dariusz Nowak.
Poland has sought the help of the international policing bodies Interpol and Europol to try to track down the criminals, he said.
"This is an absolute priority for the Polish police," added national police spokeswoman, Grazyna Puchalska.
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