The searches were conducted at 23 locations, including 18 in Kolkata and five in Ranchi, after filing an FIR over corruption charges against Dutta and others, it said.
During the searches, the agency recovered Rs 3.7 crore cash, 6.6 kg of gold and some incriminating documents including those related to a flat worth Rs 4 crore, the release said.
The CBI has registered the case against Dutta, another Income Tax officer (name withheld by the agency), six private individuals and other unknown public servants and government employees on the allegations of criminal conspiracy, illegal gratification and criminal misconduct, it said.
Dutta allegedly took huge illegal gratification from some businessmen through a chartered accountant to get the income tax assessment files of different assesses transfered from Kolkata/Hazaribagh to Ranchi, the agency's spokesperson R K Gaur had said.
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