Sinh, who was arrested by the Special Investigation Team of CBI here, was charged with criminal conspiracy, cheating and misappropriation of funds related to Saradha Realty, one of the companies of the group which is being probed by the agency, CBI sources said.
The sources said it has come up during the investigation that Sinh was allegedly in "deep nexus" with higher echelons of bureaucracy and has also been "extorting" money in their name.
They said now his questioning may throw some links with the senior bureaucrat to ascertain whether the official was involved in the scam or not.
CBI has already charge sheeted Sinh in a loan default case in February 2013 where he allegedly did not repay Rs 67 crore loan taken from Canara Bank for floating M-3 Channel.
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The sources said several other cases are also pending against him.
The sources said he was called to the CBI headquarter of here where he was grilled by the SIT for over five hours before being arrested.
They said the arrest became imminent as he was not cooperating with the investigation team prompting the agency to take him into custody.