Film director Roman Polanski has been moved from a jail near Zurich to an undisclosed location for "security reasons", Swiss officials say.

瑞士官员称，电影导演罗门·波兰斯基因“安全原因”，被从苏黎世附近一座监狱附近转移到一个秘密地点。 

Polanski, who has been held since September, is to be placed under house arrest（软禁） at his Alpine chalet on Friday after being granted bail by a court.

He fled the US in 1978 after pleading guilty（服罪） to having unlawful sex with an underage（未成年的） girl.

Switzerland is deciding whether to extradite（引渡回国，拿获归案） him to the US.

A justice ministry spokesman said Polanski left the jail in Winterthur on Thursday for "security reasons and personal protection", AP news agency reported.

The spokesman said Polanski was still expected to be taken to his chalet（小木屋） in the luxury resort（豪华度假村） of Gstaad on Friday afternoon.

The 76-year-old film-maker will be fitted with an electronic bracelet（手镯） that will activate if he attempts to abscond（潜逃，逃匿）.

The Swiss Federal Criminal Court granted the Oscar-winning director $4.5m (£2.7m) bail, pending proceedings for his possible extradition to the US.

The director of films such as Rosemary's Baby, Chinatown and The Pianist was arrested after travelling to Zurich on 26 September to pick up a lifetime achievement award.

Polanski was accused of raping a 13-year-old girl after plying（通过，使用） her with champagne（香槟） and a sedative（镇静剂） during a modelling shoot in 1977.

He was initially indicted（起诉，控告） on six counts - including rape by use of drugs, child molesting（虐待儿童） and sodomy（鸡奸） - but pleaded guilty to the lesser charge of unlawful sexual intercourse（性行为）.

Polanski fled the US on the day he was to be sentenced, and has lived in France since then.