The agency today grilled the minister's personal secretary Rahul Bhandari, a 1997 batch Punjab cadre IAS officer, who is believed to be privy to all the crucial decisions taken in the ministry.
CBI sources said they would seek clarification from Bansal on a range of issues related to elevation of Kumar in the Railway Board, why he was allowed to retain additional charge of GM (West) and were any senior officers sidelined in promoting him to Railway Board as Member (Staff).
Bansal's name crops up several times in over 1000 phone calls intercepted by the agency over a period of two months as part of surveillance on Singla and Kumar.
The sources said before approaching Bansal, the agency is likely to examine his OSD Vitul Kumar, an 1993-batch IPS officer of Uttar Pradesh cadre, who is his sister's son-in- law.
Vitul would be the second official working in the Minister's office under the CBI scanner after Bhandari.
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