Closing in on the financial trail in the Sheena Bora murder case, CBI on Thursday told a court in Mumbai that it has sought Interpol's help in seeking access to overseas bank accounts of the Mukerjeas even as it secured extension of custody of former media baron Peter Mukerjea till November 30.

Seeking Peter's custody, CBI, which had claimed financial transaction as the motive behind Sheena's murder, said investments of crores of rupees made by the Mukerjea couple and that "Indrani and Peter had formed various companies during 2006-07 and invested Rs 900 crores in them."