Canadian authorities urge people to remain vigilant as search for Kam McLeod and Bryer Schmegelsky continues

Canadian authorities have suffered a frustrating blow in their search for two teenage suspects wanted over a series of killing in remote northern Canada.

The Royal Canadian Mounted Police (RCMP) announced late on Monday that a possible sighting of Kam McLeod, 19, and Bryer Schmegelsky, 18, at a garbage dump could not be substantiated after a “thorough and exhaustive search”.

Police highlight wildlife threat as airforce joins manhunt for Kam McLeod and Bryer Schmegelsky

The threat of a polar bear attack has become a reality for the huge Canadian police and military contingent searching for the teenage duo suspected of shooting dead Australian tourist Lucas Fowler, his US girlfriend and a university botanist.

The manhunt for Kam McLeod, 19, and Bryer Schmegelsky, 18, continued on Saturday with the addition of a Royal Canadian Air Force CC-130H Hercules and personnel searching the unforgiving wilderness near Gillam, a remote area in northern Manitoba.

Police being given military air support as authorities scour areas of Manitoba for teenage murder suspects

Canada’s armed forces have been drafted in to provide air support as police go door to door in the search for two teenagers suspected in three killings in the country’s remote wilderness.

Authorities have urged “all Canadians” to be on the lookout for 19-year-old Kam McLeod and 18-year-old Bryer Schmegelsky, after the fatal shooting of a tourist couple – American woman Chynna Deese, 24, and her Australian boyfriend Lucas Fowler, 23 – and the murder of Vancouver professor Leonard Dyck, 64.