Swiss authorities have rejected an appeal to release Oscar-winning director Roman Polanski from jail. The film director was arrested last month after fleeing the United States in 1978 to avoid sentencing in an underage sex case.

Reuters is reporting that authorities are also urging the Swiss court dealing with his extradition warrant to reject another appeal by Polanski's lawyers to have him freed, and to refuse any request to release the 76-year-old on bail.

Polanski pleaded guilty to having sex with a 13-year-old girl in 1977 and spent 42 days in prison undergoing psychiatric tests. When released, he left the country because he believed a judge would sentence him to up to 50 years behind bars, despite a plea agreement.