Can't deny or confirm now Raja's involvement in 2G scam: ED

However, it said the investigations were on against the companies that were alleged to have violated foreign exchange norms in the 2008 award of telecom licences.

In a response identical to CBI, the ED said that it was conducting a fair and impartial probe into the alleged irregularities and that it was not filing a detailed affidavit at this stage as it was not in a position to confirm or deny the allegations.

A bench comprising Justices G S Singhvi and A K Ganguly had, on September 13, wanted to know how the CBI did not know against whom the investigations were on, despite continuing the process for several months and filing an FIR against unknown telecom ministry officials.

Replying to this, the CBI had asserted that it was probing the matter in a "fair and impartial" manner and that it was not in a position at this stage to deny or agree with the charges.

The ED's submission was made in connection with a case filed by some NGOs alleging financial irregularities by Raja in connivance with certain middlemen including corporate lobbyist Niira Radia in allocation of 2G licences in 2008.

The allegation is that licences were given away at throwaway prices, enabling the some of the companies to part sell at a huge valuation.

Reacting to the petition that was filed earlier this month, Raja had said that the entire controversy was politically motivated.

"...my (ED) not filing detailed affidavit at this stage may not be deemed to be admission of any of the contentions urged which I hereby deny. I further beg to submit that the investigations are being carried out in a fair and impartial manner," said the ED officer who filed the affidavit.

Along with Raja, the names of certain public servants, middlemen and corporate lobbyist Radia, have surfaced for their alleged involvement in the conspiracy for granting Unified Access Service (telecom) licences.

The ED affidavit said the alleged FEMA violations by Loop Telecom and Essar Group, was being looked by the ED on the basis of specific written complaints.