Canadian police said Wednesday they are scaling down but not abandoning the hunt in a remote and rugged part of northern Manitoba for two teenagers suspected of killing a college professor, a North Carolina woman and her Australian boyfriend.

[On Aug. 7, police said that they found the bodies of murder suspects Kam McLeod and Bryer Schmegelsky in the wilderness of Manitoba.]

Over the last nine days, police and others have used helicopters, drones, boats and dogs to search approximately 4,200 square miles (11,000 square kilometers) of tundra, muskeg and dense forests. At one point a military Hercules aircraft was used in the search, which has stretched across three provinces.

“To be clear, we’re not ending the search,” Royal Canadian Mounted Police Assistant Commissioner Jane MacLatchy told a news conference in Winnipeg.