Polanski was scheduled to receive an honorary award at the festival when he was apprehended Saturday at the airport, the Swiss Justice Ministry said in a statement. It said U.S. authorities have sought the arrest of the 76-year-old director around the world since 2005.
"There was a valid arrest request and we knew when he was coming," ministry spokesman Guido Balmer told The Associated Press. "That's why he was taken into custody."
Balmer said the U.S. would now have to make a formal extradition request.
He declined to explain why Polanski was never previously arrested in Switzerland, where he has often traveled or stayed. A 1996 interview with Canada's Menz magazine describes Polanski's visits to the luxury resort of Gstaad, where he regularly came to ski, attend festivals or escape from media pressure.
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