The Enforcement Directorate has issued summons to certain telecom firms in connection with its probe into the alleged 2G spectrum scam.
Official sources said summons have been issued to some new telecom firms asking for certain financial records and documents.
However, it could not be confirmed as to which particular telecom firms have been issued the summons.
The CBI is already investigating the 2G scam and had on Monday told the Supreme Court that it will complete investigation and file a chargesheet within three months.
The ED had also registered a case under the Prevention of Money Laundering Act and was working in close cooperation with the CBI.
Sources said besides the telecom firms, certain other individuals connected with the case have also been issued summons to appear before it.
CBI had said it will take two months time to finish the investigation as it was examining transcripts relating to 5,000 calls (out of which 3,800 have been analysed), 6,000 files and 80,000 pages of documents.
Some of the firms which received spectrum allocation in 2008 were Uninor (Unitech), Etisalat (Swan) Estel, Videocon, Loop, Sistema Shyam, Tata and Rcom.