The agency placed its latest status report of its investigation in the scam in a sealed envelop before a bench comprising justices G S Singhvi and A K Ganguly in which it has said that it is seeking the help of foreign authorities in tracking the source of money.
Senior Advocate K K Venugopal, appearing for ED, said Letters Rogatory has been sent to Singapore, Cyprus, Jersey and Virgin Islands in connection with the 2G spectrum scam.
Similar communications were being sent to two more countries. He said 31 companies have so far been summoned and statements of 26 companies have been recorded.
He said some hawala operators were also allegedly involved in the scam and their premises were raided and they were being questioned by the ED.