Income Tax (IT) officials on Tuesday raided 33 premises in Tamil Nadu belonging to three business groups, said a senior tax official.

This is the second major raid by the IT Department after its multi-city searches linked to jailed AIADMK leader V.K. Sasikala's kin and business associates.

Earlier, an IT official told  that the raids were a follow up to the earlier search operations.

Officials said the latest search operations were linked to unnamed shell companies.

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