CBI sources said Birla had written a letter to the Prime Minister's Office which had forwarded the letter to the Coal Ministry.
The investigating agency yesterday claimed to have made a fresh recovery of documents from Aditya Birla group which included retail invoice of gold coins totalling to Rs 94 lakh, investments in various schemes to the tune of Rs 17 lakh besides Rs 24 lakh ‘petty cash'.
The CBI on Tuesday filed a case against Birla and former Coal Secretary Parkakh, on charges of criminal conspiracy and corruption in connection with alleged irregularities in allocation of Talabira coal blocks in Odisha in 2005.
The CBI action met with criticism from India Inc which said that businessmen cannot be made scapegoats on the basis of mere suspicion as such incidents would further widen the government-industry trust deficit.