FILE - This Friday, Feb. 18, 2011 file photo, shows the Memorial on the grounds of the former German Nazi Death Camp Treblinka, near the village of Treblinka, northeast Poland. A Polish law that criminalizes accusing the Polish nation of crimes that were committed by Nazi Germany has taken effect, Thursday March 1, 2019. The law has sparked a crisis with Israel, where officials fear its true aim is to repress research on Poles who killed Jews during World War II, something Polish officials deny. (AP Photo/Alik Keplicz, File)

FILE - This Friday, Feb. 18, 2011 file photo, shows the Memorial on the grounds of the former German Nazi Death Camp Treblinka, near the village of Treblinka, northeast Poland. A Polish law that criminalizes accusing the Polish nation of crimes that were committed by Nazi Germany has taken effect, Thursday March 1, 2019. The law has sparked a crisis with Israel, where officials fear its true aim is to repress research on Poles who killed Jews during World War II, something Polish officials deny. (AP Photo/Alik Keplicz, File)

WARSAW, Poland (AP) — A Polish official said Friday that Germany could owe his country $850 billion (690 billion euros) for the damage it inflicted during World War II.

Arkadiusz Mularczyk is leading a team in the parliament that is assessing potential reparations to Poland. Germany killed 6 million Polish citizens and caused great material losses during its nearly six-year occupation of Poland.

“We are talking about very large, but justified amounts of compensation for war crimes, for destroyed cities, villages and the lost demographic potential of our country,” Mularczyk said on Polsat News, a private broadcaster.

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Last year, Poland’s ruling conservative nationalist Law and Justice party said the nation deserves compensation for its losses and set up a team of lawmakers under Mularczyk’s leadership to estimate how much is due.

To date, Poland has not made an official demand. Germany has repeatedly said there is no legal basis for Poland’s reparation claims because the matter was settled in a 1953 agreement.

Poland’s current authorities have argued the 1953 decision is invalid because it was dictated by Moscow when Poland was a satellite of the Soviet Union.

Since then, Germany has paid some compensation to individual Poles who were forced laborers or victims of German pseudo-medical experiments during the Nazis’ wartime occupation.