CBI has also quizzed former Minister of State for Coal Dasari Narayan Rao and the Prime Minister's Advisor T K A Nair in the case.
According to the FIR, Neyveli Lignite Limited was to be given Talabira II coal block but Parakh allegedly favoured Hindalco and allowed it to share the block with Neyveli leading to notional loss to the exchequer.
Parakh has denied any quid pro quo as alleged by CBI in its FIR about his meeting with Kumar Mangalam Birla, Chairman of Aditya Birla group of companies, and also maintained that there was no pressure exerted by the Prime Minister's Office (PMO) in clearing the deal in favour of the Birla group.
CBI has also completed examining top executives of the Rs 2.4-lakh-crore Birla company in connection with the allocation, sources said, adding.
However, no decision to summon the group's chairman has been taken so far.
Parakh was in news recently after release of his book on coal blocks allocation in which he had questioned the rationale of the CBI to name him and Kumar Mangalam Birla.
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