The operation was initiated in the West Bengal capital and adjoining areas in early hours based on inputs provided by the Intelligence Bureau about an alleged fake lottery racket which has its tentacles spread upto Tamil Nadu.
The IT sleuths seized the money shortly before it was to be sent to Dubai today through hawala channels, sources said.
"Investigators have so far counted Rs 45 crore cash and the amount may go upto Rs 50-55 crore," they said.
A highly-placed Kolkata police officer said various teams, consisting of members of STF and its anti-bank fraud section, helped the tax department sleuths conduct the raids at five places in the city.
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"Raids are being conducted at four places in New Alipore police station limits and one on Sarat Bose Road area today," the officer said.
The alleged kingpins, identified as S Nagaarjuna and Santiago Martin, are under the scanner of the agencies. They said Martin was apprehended by Enforcement Directorate about two years ago in Chnennai and had seized from him Rs 7 crore in cash.
The owners of the places raided today were found absconding and the sleuths only came across persons who were appointed as peons there, the police officer said adding no person has been arrested in this connection till now.
The firms could not be reached for comments.
Sources said the entire racket could be worth about Rs 1,000 crore.
"The agencies are probing if this stash was being ploughed into money laundering activities," they said.
They said a few locations in Siliguri are also being searched by the sleuths even as the teams have recovered and seized a number of documents including bank accounts and business receipts.