The CBI on Wednesday carried out searches at the premises of corporate lobbyist Niira Radia and former TRAI chairman Pradeep Baijal in connection with the alleged 2G spectrum scam, a week after conducting raids at the residences of former Telecom minister A. Raja. Baijal was the TRAI boss between 2004 and 2008. He joined Radia's firm in 2009. According to reports, the CBI is carrying out raids at 27 places in Tamil Nadu and seven places in Delhi in connection with its probe.