India today conveyed to his Canada, concerns about the activities of anti-India extremist groups operating from that country. <br/><br/>Prime Ministers Manmohan Singh conveyed New Delhi's concerns during a meeting in Washington with his Canadian counterpart. <br/><br/>The External Affairs Ministry spokesman Vishnu Prakash told reporters while briefing on the meeting between the two Prime Ministers, said the Canadian Prime minister, Stephen Harper assured that his government would do their best and the two sides agreed that the officials would remain in touch. <br/><br/>Dr. Singh noted that the 25th anniversary of Kanishka bombing, carried out by Khalistani groups, would be observed in June. <br/><br/>India's expression of of concern comes amidst reports that Khalistani groups were trying to regroup again. <br/><br/>The two leaders also reviewed cooperation in trade and economic area.<br/>