The FBI allegedly possesses secret documents" about the American billionaire [Jeffrey Epstein] that could provide evidence for under-age "sex slave" accusations against him, [which include] forcing a 17-year-old girl to have sex with Prince Andrew, Duke of York. FBI documents are said to show that Epstein controlled under-age girls who could provide evidence about the claims. In May last year, prosecutors surrendered 541 pages of correspondence with Epstein's lawyers leading up to a 2008 non-prosecution agreement. A letter released by the court last year showed Brad Edwards, [alleged victim Virginia] Roberts's lawyer, telling the US attorney's office that Epstein "may be the most dangerous sexual predator that the country has ever seen". The letter continued: "The evidence suggests that for at least four years he was sexually abusing as many as three to four girls a day. "He uses his extraordinary wealth and power to lure in poor, underprivileged little girls and then also uses his wealth to shield himself from prosecution and liability." Lawyers for Virginia Roberts ... have said that evidence against the billionaire was covered up after lobbying by his "political and social" connections. Epstein pleaded guilty in 2008 to a single charge of soliciting prostitution.