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One man in his forties survived and was taken to hospital in the city of Czestochowa in serious condition, 207 kilometres (129 miles) south-west of Warsaw.
"From what we know 11 people were killed," said Justyna Sochacka, spokeswoman for the Air Rescue said. "There were 12 people onboard the plane."
A spokesman for the headquarters of fire services, Pawel Fratczak, said the crashed plane was a Piper PA-31 Navajo.
"The plane caught fire after it hit the ground," Fratczak said.
The Piper PA-31 Navajo plane is produced by U.S. firm Piper Aircraft.
The plane, which had been operated by a private parachuting school, took off from the Rudniki airfield just outside Czestochowa, Fratczak added.