Tata group chaiman Ratan Tata and corporate lobbyist Nira Radia were summoned by the PAC over their possible involvement in the 2g licence scam.

Nira Radia has been tapped along with Ratan Tata in conversation with various politicians, bureaucrats, industrialists, and journalists.

The PAC, which has been enquiring into alleged irregularities in the grant of telecom licences, earlier this month, summoned the Editors of Outlook and Open magazines, Vinod Mehta and Manu Joseph, respectively as well after magazines published parts of the Radia tapes.