The Special 2G Court today discharged all the accused in the additional spectrum case of 2002 due to lack on incremental evidence.
Mittal and Ruia, whose names were not mentioned in CBI's charge sheet as accused, were, however, summoned on March 19, last year by the special CBI court saying there was "enough material" to proceed against them in the case.
The CBI will begin its investigation in the grant of additional spectrum to Bharti Airtel, Vodafone and others next week.
2G scam: CBI registers case, raids Vodafone, Airtel offices
The Central Bureau Of Investigation (CBI) on Saturday filed fresh case about discrepancies in 2G spectrum allocation during BJP leader Pramod Mahajan's tenure. CBI conducted raids at Vodafone office in Mumbai and Airtel office in Gurgaon.