Income Tax department has detected undisclosed income worth over 3,651 crore rupees and seized new notes worth more than 98 crore rupees as part of its country-wide operations against black money after demonetisation. <br/><br/>Official sources said in New Delhi that the taxmen have carried out a total of 785 search, survey and enquiry operations under the provisions of the Income Tax Act, across the country, since the note ban was declared on November 8. The department has also issued 3,647 notices to various entities on charges of tax evasion and hawala-like dealings, till Thursday.<br/><br/>The agency has also referred over 230 cases to the Enforcement Directorate (ED) and 190 cases to the CBI in order to enable them probe other financial crimes like money laundering, disproportionate assets and corruption as part of their legal mandate.