With disgraced US financier Bernard Madoff now behind bars, attention has turned to whether others were involved in his estimated $50bn (£35bn) fraud.
While Madoff insists he acted alone, prosecutor Lev Dassin said he was investigating if others had joined in the crime.
Investigators are also continuing work to see how much of the stolen funds can be recovered.
Madoff has been remanded in jail ahead of his sentencing in June.
