But close scrutiny showed the passport was fake. It would have gone down as another case of illegal immigration had Rajan not told investigators he was a Sri Lankan Tamil who had illegally crossed over to India.

His original name was Sivapalan and apart for his Indian passport, he was also carrying documents to prove his Sri Lankan identity. Sivapalan explained he planned to show his original Sri Lankan documents on reaching America. "He would have claimed to be an LTTE sympathizer," said a source who interrogated Sivapalan.

Sivapalan had got his boarding pass before he was detained, indicating some kind of connivance with airline staff. It is also clear that Sivapalan got his Indian passport from a gang that catered to Sri Lankan Tamils.

The gang has links to an illegal immigration racket busted in Chennai. On October 22, the Chennai police arrested two agents - Mahenthiran Kajenthiran and Vellaiyan Tharamalingan - from Vetri Nagar and recovered 27 Indian passports of Sri Lankan Tamils from their houses. Seven Sri Lankan passports and some visa stamps of UK and other western countries too were found.

The passports were meant for Sri Lankan Tamils but the racket was busted before they could be handed over to clients. What startled the authorities was recovery of LTTE propaganda, indicating the gang was helping Sri Lankan Tamils flee India.

During interrogation, the agents gave details of a well-oiled operation in which LTTE cadres or sympathizers are sent abroad. The gang was led by a person named Kalidass, arrested later.

Kalidass used to take people to exotic European locales posing as film crew. But the crew never returned.Authorities are still clueless on the whereabouts of such Sri Lankan Tamils whose passports the gang prepared. So far, only their names are known.