India made a "horrific mistake" by attempting to violate Canada's sovereignty, Prime Minister Justine Trudeau said.

Justin Trudeau says India's alleged interference in Canada was "a horrific mistake." More Videos. Couples compete in North American Wife-Carrying competition

The U.S. and British governments in the last 24 hours have urged India to fully cooperate with ongoing investigations by Canadian authorities alleging Indian government officials had committed "serious" crimes in Canada.

The UK says Delhi's co-operation is the "right next step" after Canada accused Indian agents of criminal activity in the country, which India denies.

The British government says India should co-operate with Canada's investigation into claims that New Delhi has been involved in an escalating number of violent crimes in Canada, as an analyst warns that strategic interests might limit how allies respond to the bombshell claims.