"I cannot think of any other country that is more important for the LTTE as Canada, to regroup and continue their campaign against Sri Lanka," said Prof. Rohan Gunaratna, head of the International Centre for Political Violence and Terrorism Research.

Gunaratna is advising the Canadian government as it investigates the 76 Tamil migrants currently in immigration custody in Vancouver. The men were found aboard a ship seized off the coast of British Columbia on Oct. 17.

Lawyers for the men have said they are not Tamil Tigers, but Gunaratna disagreed.

"There are many members of the Tamil Tigers on board that vessel," Gunaratna said in an interview from Singapore. The Tigers — banned in Canada as a terrorist organization — were defeated in May 2009 after a 23-year insurgency.

Gunaratna also alleged that a Canadian — Ravi Shankar Kanagaraja — was the mastermind behind the ship's arrival.

"He arranged for this ship to come to Canada, and right now the Canadian authorities are hunting for him," Gunaratna said.

In Ottawa, Immigration Minister Jason Kenney suggested Tuesday he was heeding the advice of the government's expert for now.

An immigration hearing Monday for one of the migrants was told that residue of two chemicals used in explosives was found on clothing owned by two of the men aboard the vessel.

Monday's hearing was also told that the identity of the ship was hidden on its voyage to Canada because it was known to have been used to ship arms for the LTTE, reported the CBC.