Bari, January 16 - Italian actress Manuela Arcuri and showgirl Sara Tommasi are among 26 injured parties in a prostitution case in which former premier Silvio Berlusconi is a defendant, court filings showed Wednesday. Prosecutors are investigating claims that Giampaolo Tarantini, an entrepreneur from Bari, attempted to extort money from Berlusconi, at the time still Italy's premier, in exchange for telling prosecutors that Berlusconi had no idea the girls at parties held in his Rome residence in 2008 and 2009 were paid escorts. Many of the other injured parties are professional escorts. In a statement, the judge called the women victims whose "freedom and human dignity" had been harmed. A preliminary hearing is scheduled February 8.