The CBI, which is probing irregularities in the allocation of 2G spectrum and licences, suspects that parts of the illegal pay-offs in the scam may have been invested in African countries.
A source, not authorised to speak to the media, said the CBI believes corporate lobbyist Niira Radia was part of an exercise to make investments in African countries such as Senegal and Guinea, and also in Mauritius.
"The investments appear to have been made during 2008-09. We are looking into the possibility that part of the illegal payoffs could have landed as investments in those countries."
The CBI is looking at links between Radia and at least four mobile service providers that were allotted spectrum and licences by the telecom ministry under former minister A Raja.
Radia, the source said, had allegedly been instrumental in getting spectrum and licences for at least four firms during Raja's stint. Raja and Radia have been quizzed by the CBI about their role in the conspiracy. The agency has been verifying whether Radia and her associates accessed confidential documents and policy papers from the telecom ministry.
The CBI also suspects the money is spread in countries such as Singapore, Isle of Man, Cyprus, UAE, Norway, Libya and Russia.
It has sent its letters rogatory to Mauritius authorities for details on suspicious bank transactions and entities.
The probe agency is also verifying if those allotted spectrum and licences had allegedly influenced Raja's decision to price the licences at rates prevalent in 2001, without revising them for 2008. It had registered a case on October 21, 2009 against unknown officials of the telecom department and unknown private persons/ companies and others in connection with the irregularities.