Koda was questioned recently for his alleged role in allocation of Amarkonda Murgadangal coal block in Birbhum, Jharkhand to two firms of Congress' Lok Sabha MP and industrialist Naveen Jindal, official sources said.
Koda was shown papers related to the allocation of the coal block and asked about the then Jharkhand government's role in helping Jindal's firm get it, they said.
CBI had on June 11, last year registered a case against former Minister of State for Coal Dasari Narayan Rao and Naveen Jindal for alleged cheating, graft and criminal misconduct in the coal block allocation.
They said the misrepresentation was allegedly done on three counts-- land, water supply and previous allocations.
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Jindal and his companies have denied of any wrong doing.
Sources said JSPL allegedly claimed in application submitted in January 2007 that they had only three coal blocks with them where as actually they had at least six blocks.
The sources said this was done to boost their eligibility for the coal block as the Government was mulling to avoid monopoly of single company by not allocating large number of blocks to one firm.
Rao, a former Congress Rajya Sabha MP, held position of Minister of State for Coal between 2004-06 and between 2006 and 2008. He has already been quizzed by the agency in connection with the probe in coalgate.