Italian prosecutors have alleged that Italian Prime Minister Silvio Berlusconi had sex with a "significant number" of young prostitutes. In a request to search some of Mr Berlusconi's properties, they cited allegations that he had paid the women or given them free use of apartments. The prosecutors are investigating whether Mr Berlusconi paid to have sex with a 17-year-old nightclub dancer. Mr Berlusconi says he has never paid for sex. The document that emerged on Monday was published on the website of Italy's lower house of parliament. It was announced on Friday that Mr Berlusconi was under investigation. Prosecutors have to make a request to a parliamentary committee if they want to search the property of a member of parliament. The document includes allegations that Nicole Minetti, a former dental hygienist of Mr Berlusconi's who is now a regional official, was involved with several others in procuring the young prostitutes for the prime minister. It details claims that a number of young women were put up in apartments in Milano Due, an American-style suburb that Mr Berlusconi built during the 1970s. Ms Minetti, who is under investigation, has denied the accusations. Prostitution is not a crime in Italy, but paying for or helping arrange sex with a prostitute under the age of 18 is an offence.