The Enforcement Directorate has questioned former Telecom Minister A Raja's close aide R K Chandolia in connection with the alleged 2G spectrum scam and indicated that more officials are under its scanner.
Official sources said Chandolia, who served as the personal secretary to Raja at the time of the controversial spectrum allocation in 2008, was questioned for seven hours by the ED on Thursday.
Chandolia, who is believed to be in the know of all the transactions in the controversial spectrum allocation, was summoned under relevant sections of the Prevention of Money Laundering Act.
Sources said the official, who was sent back to his parent department Indian Economic Services within days of new Telecom Minister Kapil Sibal taking charge, was quizzed on the issue of the first-come-first-serve basis for allocation of spectrum in 2008 after the cut off date for receiving applications was advanced by a week from October 1, 2007 to September 25.
They said Chandolia, besides being asked about his personal financial details, was also questioned on the role played by corporate lobbyist Niira Radia.
The sources said Chandolia wrote down several pages of his statement about the alleged scam, which is also being probed by the Central Bureau of Investigation.
Sources said the directorate is likely to summon Chandolia again as part of its investigation. They said certain other government officials, whose names have cropped up during the probe, will also be questioned soon but did not elaborate.