The agency told Additional Sessions Judge Raj Kapoor that the investigation is at an initial stage and if released on bail, accused Surendra Kumar Jain and his brother Virendra may tamper with the evidence.
The court has now put up the matter for further hearing on April 7.
The counsel appearing for the ED said that during their search, the agency seized various incriminating evidence.
"The money generated from crime can be used for anything, including terrorism," the agency's counsel said.
The ED had arrested the accused on March 20. It had claimed that at least 90 shell firms were under its scanner and it had identified 26 of them for allegedly laundering around Rs 62.20 crore.
The case emerged after the ED filed a criminal complaint last month under the Prevention of Money Laundering Act (PMLA) based on a charge sheet of the Serious Fraud Investigation Office against certain individuals and firms.
The ED had also recently attached assets valued at Rs 64.70 crore of a firm based here and this investment, it had said, is "managed by" Radisson Blu, a luxury hotel in the national capital.
It suspects the entire racket involves around Rs 8,000 crore of slush funds and has detected about half of it.
"The modus operandi of Jain brothers was to launder the unaccounted money through the process of placement of funds, layering of transactions and the final integration of laundering money into the banking channel camouflaged as legitimate share premium transactions.
It added during probe of some other firms "controlled" by these brothers, it has emerged that during a "short period of three months between the opening and closing of the accounts of these companies, there was credit and debit summations to the tune of Rs 8,000 crore."
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