Royal Canadian Mounted Police
There is no known antidote to the poison ricin.
Cost-sharing arrangement with the Met in the UK will end “in the coming weeks”.
The pair filmed themselves confessing to the murders before taking their own lives.
Originally reported missing, Kam McLeod, 19, and Bryer Schmegelsky, 18, vanished into the Canadian wilderness for three weeks, before being found dead.
It is not known if the pair are armed, or what their motives may be.
The event addressed the mysterious deaths of an American woman and her Australian boyfriend in British Columbia.
'Some parents are waiting to hear if their kids are alive.'