Stade Roland Petit was used as an execution camp at the start of World War II . Gunther asked if the tennis stadium is still being used to hold prisoners , and whether any Jews were being held there . Paris - based research center holds letters from former political prisoners . Author Arthur Koestler was born at the tennis stadium in French capital . Official documents reject claims that it was used to hold Jews before deportation .
Stade Roland Petit was used as an execution camp at the start of World War II . Paris - based research center holds letters from former political prisoners . Author Arthur Koestler was born at the tennis stadium in French capital . Official documents reject claims that it was used to hold Jews before deportation .