(CNN) The Royal Canadian Mounted Police will begin knocking on every door in a small town in rural northern Manitoba in hopes of generating tips in the search for two teens wanted in the killings of a road-tripping couple and university teacher.

Police will canvass in Gillam and Fox Lake Cree Nation over the next 72 hours, Cpl. Julie Courchaine, the RCMP Manitoba spokeswoman, said Friday at a press conference.

The search for Kam McLeod, 19, and Bryer Schmegelsky, 18, has taken authorities about 2,000 miles across Canada's rural north -- from British Columbia to Manitoba -- in a case with victims with three nationalities.

"Our investigators are also exploring the possibility that the suspects may have inadvertently received assistance in leaving the area," Courchaine said. "To restate, there have been no confirmed sightings outside of the Gillam area, however we remain open to the possibility."

The RCMP said Saturday that authorities have "thoroughly searched" over 100 empty homes in Gillam and have searched large, abandoned buildings, one of which has over 600 rooms.