Being John Malkovich proved to be rather less fun than the eponymous comedy movie on Friday after the American actor found out his Prague hotel room had been burgled.

"We can confirm than an investigation is under way in the case of the disappearance of Mr. Malkovich's personal belongings," said a spokeswoman for the Mandarin Oriental hotel.

Malkovich, 57, performed in the murder melodrama "Infernal Comedy," based on a real Austrian serial killer, at the Prague Spring music festival on Thursday, and was due to fly to Poland on Friday.

News website www.idnes.cz quoted the festival's director as saying the thief took two mobile phones.

Malkovich starred in the 1999 comedy "Being John Malkovich" where a puppeteer finds a passage into the mind of Malkovich.

He was nominated for best supporting actor Oscar for "In the Line of Fire" and "Places in the Heart."