(CNN) — The manhunt for two young men suspected in the killing of three people in Canada shifted to a remote community of about 500, but a tip on the suspects' possible whereabouts has not panned out, authorities said Monday.

The Royal Canadian Mounted Police had urged residents of York Landing, a small community in Manitoba located along the eastern bank of the Nelson River, to remain inside, lock their doors and windows and to "report anything suspicious."

"We're making a plea to the public to send in tips," RCMP spokeswoman Cpl. Julie Courchaine said.

Investigators had focused the search on Gillam, a tight-knit community of about 1,000 people, before turning their efforts to York Landing, about 90 kilometers (55 miles) southwest.

Courchaine said police received a tip around 5 p.m. Sunday that two men matching the suspects' description were seen in York Landing, an area so remote she said it's only accessible by small plane or a two-hour ferry ride.

Officials on Monday afternoon said while they were not able to substantiate the information, officers will continue the search in York Landing and Gillam.

"We thank the community for their patience & understanding & ask them to continue to be vigilant," the RCMP's Manitoba office tweeted.

Authorities have said Kam McLeod, 19, and Bryer Schmegelsky, 18, are wanted in connection with three killings -- a botany professor at the University of British Columbia and a young couple who was traveling across Canada.

The RCMP said they were searching cottages, cabins, waterways and other areas in and around York Landing for the suspects. Courchaine said the Royal Canadian Air Force was also assisting in the search.

Courchaine told reporters at a news conference that officers "have not made contact with the individuals and so we are not yet in a position to confirm that these are the wanted suspects."

"Our goal today remains to safely locate, apprehend, and identify the individuals."

She described the tip as "credible," but would not elaborate on where the tip came from.