Officials from the Income Tax department questioned Tamil Nadu chief secretary Rama Mohana Rao, his son Vivek and his two personal secretaries on Wednesday after searching his residence and office.
The questioning came after Rao reportedly admitted undisclosed income of Rs 5 crore from unknown sources.
Tax officials said Rs 30 lakh in new Rs 2,000 notes, five kilograms of gold and documents with details of undisclosed assets worth about Rs 5 crore were recovered during the raids carried out at 11 places.
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Sources said that the Central Bureau of Investigation (CBI) and the Enforcement Directorate (ED) may file cases against Rao, his son and two others in this regard.
Meanwhile, the I-T sleuths continued searches of Rao’s house and office till late night during which they seized at least 25 important documents.