The recently unearthed terror module plotting bomb attacks on key installations in Tamil Nadu has no direct link with banned outfits such as the Students Islamic Movement of India and Lashkar-e-Taiba, the police said in Chennai on Thursday.

"This specific module has no direct links with such groups," Intelligence Inspector General Jaffer Sait said while replying to queries but declined to disclose further details as the investigation was going on.

To a question on whether sleeper cells of SIMI [Images] or other terrorist networks existed in the state, he said: "As of now, there is no information, but investigation is on in this direction also."

Police teams had gone to Ahmedabad and Hyderabad to study the pattern of the serial explosions in those cities, he said.

The state police had on Sunday claimed to have averted a major tragedy by busting a terror module that had planned to carry out explosions in Chennai and Tirunelveli.

Three persons, including the `mastermind' of the module lodged in the Puzhal prison, have been arrested.

Abdul Gafur, an employee in a footwear firm in Chennai, revealed the conspiracy after he was arrested from Pettai in Tirunelveli, following which Heera alias Mohammed Kasim and Ali Abdullah, the 'mastermind', who hatched the conspiracy even as he is lodged in the Puzhal jail, were held.