The agency has also started an enquiry against Vishal Mehta, the then CEO of Vaishnavi, unknown officials of DoT and unknown officials of Unitech in connection with grant of spectrum to Unitech.
A bench headed by Justice G S Singhvi had identified 23 issues which were framed by a apex court-appointed probe team on the analysis of the tapped conversations of Radia with bureaucrats, politicians, corporate tycoons and scribes.
It then ordered a CBI probe into 14 issues last week.
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