Agency sources said the three secretaries of departments, which were part of the decision making process, might be questioned regarding recommendation given to JSPL and Gagan Sponge.
They also said that one of these secretaries was considered close to the then Chief Minister Madhu Koda.
Three meetings of 35th screening committee took place in Delhi for the allocation of the block in June 20-23, July 30 and September 13 in 2007.
However, there was a sudden change in the opinion of the Jharkhand government and it said that the block should be given only to JSPL and Gagan Sponge thus withdrawing its recommendations to the third company.
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The sources said the coal block which was to be shared between three companies was finally awarded to only two companies which have been named in the latest FIR registered by the agency for alleged irregularities.
The sudden change in the stance of the Jharkhand government has come under the scanner of CBI and it might soon question the officials who were part of the decision making process.