The Canadian Tamil Congress (CTC), which serves as the voice of Tamil Canadians, said that someone broke into its headquarters late Saturday or early Sunday.
Only the computer "containing important information on families linked to the 492 migrants on the Sun Sea was stolen," the Congress said, adding in a statement that it hoped the details had "not fallen into the wrong hands.
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The stolen data contained the names of possible passengers and the contact details of Tamil families in Sri Lanka, Canada and other countries who were looking for their next of kin and thought they might have been aboard.
CTC spokesman David Poopalapillai told AFP he suspected the Sri Lankan secret services might have been behind the break-in.
"They may have had a hand in this.
It is up to the police to find out," he said.
The Sun Sea reportedly spent 90 days traveling from Thailand before police boarded it in Canadian waters and piloted it ashore in western Canada on August 13.
Sri Lanka's government ha