The ED had earlier cited him as the main kingpin before the court in the coal transportation scam.
Maneka Gambhir turned up in front of ED’s CGO complex office in Salt Lake shortly after midnight as she was issued a summon by the central agency.
Coal scam: CBI searches Bengal minister’s houses; Trinamool holds rallies against 'misuse' of probe agencies
Similarly, the search was carried out for nearly six hours at his three houses in Asansol. Besides, the central agency questioned Ghatak in a guest house for four hours.
The searches are being carried out at six locations, five in Kolkata and one in Asansol, officials said on Wednesday.
The judge also directed the central probe agency to file affidavit in opposition to Gambhir's petition by three weeks and the petitioner to file her reply to it within another two weeks thereafter.
According to an official source, the previous AIADMK government found several discrepancies with coal stock in 2020.
Special CBI Judge Arun Bhardwaj also imposed a fine of Rs 1 Lakh on Gupta, and Rs 50,000 on Kropha for conspiring to cheat the government for the allocation of Grace Industries Ltd, Nagpur.
Former coal secretary HC Gupta and former joint secretary in the coal ministry KS Kropha were convicted on Friday for criminal conspiracy, cheating and corruption in a coal scam case.
Coal Secretary H C Gupta was earlier convicted in three other coal scam cases and his appeal against those convictions is pending before Delhi High Court.
Among others who find mention in the charge sheet are private companies and unknown officials of the CISF and Railways, a CBI statement said.
The central probe agency had announced a reward of Rs one lakh for providing information about absconding former Trinamool Congress youth leader Vinay Mishra in the case.
Abhishek Banerjee, TMC MP and nephew of West Bengal Chief Minister Mamata Banerjee, and his wife Rujira have been questioned in this case by the ED.
The Canning Purba legislator claimed that he had a few prior engagements because of which he could not appear before the agency sleuths for questioning.
Saokat Molla has been asked to appear before CBI sleuths at the agency's city office by 11am on Friday.
Senior advocate Kapil Sibal, appearing for the petitioners, said they are not preventing investigation in the matter and the ED can come to Kolkata and conduct the probe.
Agarwal, an aide of kingpin Anup Majhi, has been summoned next week for interrogation in connection with the scam, sources said on Wednesday.
A special court today held former Jharkhand chief minister Madhu Koda and ex-coal secretary H C Gupta guilty of corruption and other charges in a coal scam case.
A special court today deferred till October 25 the hearing in 2G spectrum allocation scam cases in which former telecom minister A Raja and DMK MP Kanimozhi are among the accused.