During the meeting at Nuclear Security Summit, Singh also noted that this year marked the 25th anniversary of the bombing of Air-India flight Kanishka.
The two leaders also reviewed bilateral relations and discussed regional and global issues of mutual interest. Both Prime Ministers agreed to intensify economic and trade relations.
Briefing to reporters on the talks, external affairs ministry, Vishnu Prakash said, "Manmohan Singh conveyed India's continuing concerns over the activities of terrorist organisations in that country,"
"Manmohan Singh hoped that the Canadian government will curb and monitor the activities of these organizations," said Prakash.
Manmohan Singh also discussed with Harper the forthcoming G20 summit Canada will host in Jun 2010.
Harper sought Manmohan Singh's views on the G20 summit and the need for promoting balanced and sustainable growth, said Prakash.