Canadian police have confirmed that the two bodies found in northern Manitoba last week are those of the teenagers suspected of having killed a Sydney man and his American girlfriend.

Key points: Police said Kam McLeod and Bryer Schmegelsky had been dead for a few days before their bodies were found

Police said Kam McLeod and Bryer Schmegelsky had been dead for a few days before their bodies were found Police are testing guns found nearby to see if they were used in the murders

Police are testing guns found nearby to see if they were used in the murders The pair eluded police for weeks during a nationwide manhunt

Police said Kam McLeod and Bryer Schmegelsky apparently took their own lives.

The Royal Canadian Mounted Police said the men had been dead for a few days before their bodies were found on August 7, near the town of Gillam, but it was not known exactly when they had died.

The two fugitives were suspected of killing Australian Lucas Fowler and his girlfriend Chynna Deese, and were charged with killing 64-year-old Leonard Dyck.

Canadian police said two guns were found alongside the teens' bodies and that they would conduct forensic analysis to confirm if they were used in the three murders.

The police manhunt spanned hundreds of kilometres across four Canadian provinces.

The search focused around the Gillam area after police found a burnt-out Toyota RAV4 they had stolen from Mr Dyck and items belonging to the pair on the banks of the Nelson River.

Space to play or pause, M to mute, left and right arrows to seek, up and down arrows for volume. Watch Duration: 16 seconds 16 s Police released CCTV footage of Kam McLeod and Bryer Schmegelsky in a shop during their time on the run

Their bodies were found 8 kilometres from the stolen vehicle.

Lucas Fowler and his girlfriend Chynna Deese were killed beside a highway in British Columbia. ( Supplied: NSW Police )

At its peak, the investigation included members of the Canadian air force and military, as well as drones, dogs, emergency crews and RCMP major crime units.

Police said there were "strong indications" the fugitives were alive for a few days during the intensive search of the Gillam area.

Police said the fugitives drove the equivalent of London to Moscow — in Australian terms, roughly equivalent to the distance between Adelaide and Perth — while on the run.

Mr Fowler and Ms Deese were shot dead on the side of a highway south of Liard Hot Springs in British Columbia and their bodies were found on July 15.

Mr Dyck's body was found on July 19 on a British Columbia highway approximately 500 kilometres away.

Searches of remote areas were taken both on foot and in the air. ( Twitter: RCMP Manitoba )

A spokesman for Ms Deese's family put out a statement in the wake of this morning's announcement, extending "our deepest thoughts, prayers and love" to Mr Fowler's family.

"A terrible evil was visited upon Chynna and Lucas. An evil that has shaken us and others to the core. It's enough to make us want to just stay inside and not risk venturing out into the world," the statement said.

"But there's one thing I'm certain of amidst all of the unanswerable questions — Chynna and Lucas believed that this world is full of beauty and good that is so worth exploring.

"They wouldn't want us to let fear keep us inside of the house. They'd want us to continue to believe that there is more beauty and good in this world than there is evil, and to not just take their word for it, but to go and see it for all the wonder and joy that it has to offer."