"Those who allege CBI works on government instructions, they should answer now, how they feel about the CBI action?" Jaiswal told reporters here, commenting on the development.
Jaiswal's comments come following CBI registered cases against five companies and unknown government officials as part of its probe into alleged irregularities in allocation of coal blocks.
Five FIRs have been filed against five companies and unknown government officials for alleged cheating. The agency sleuths were also conducting searches at 30 places in ten cities including Delhi, Mumbai, Kolkata, Patna, Hyderabad, Dhanbad and Nagpur.
"Please, ask those people who give CBI a bad name when it suits them," Jaiswal said.
The filing of FIRs comes three months after registration of a Preliminary Enquiry into the coal scam by the agency on the directions of the Central Vigilance Commission.
During the Preliminary Enquiry, the CBI was informed by the Coal ministry officials that it had issued show cause notices to some of the firms which were allocated the mines for explaining the delay in conducting the mining work.