Police in Papua New Guinea say doubts have been raised about the claims of a British man and American woman who were attacked on the Kokoda Track last week.
The couple, who are in their early 30s, told police they had been attacked by two men armed with spears and machetes while walking the famous track on January 11.
The man alleged he had been beaten and robbed, and police said the woman reported being raped.
They were evacuated by helicopter from a village along the track and left the country soon after.
PNG police arrested three men over the alleged attack, two of whom remain in custody.
But Royal Papua New Guinea Constabulary Chief Superintendent Dominic Kakas told the ABC they were now questioning aspects of the tourists' statements.
"We are doing our own checks on what we have been provided," he said.
"We are now trying to re-establish the facts and what has happened."
Police are expected to give an update on their investigations once the medical report on the couple has been released.
The ABC has approached the British man for comment.
Examination of statements don't add up: trekking guide
Experienced Kokoda trekking guides have questioned elements of the couple's story, including why they were walking the track during the wet season and did not engage a local guide.
Charlie Lynn, a New South Wales state politician, runs tours on the track and told Pacific Beat there were inconsistencies in the couple's story.
"They [the trekkers] said they were stripped virtually naked, taking their shoes and all of their possessions ... and then they walked 15-and-a-half kilometres in bare feet to Alola village," he said.
"If they had have walked in bare feet, their feet would have been severely lacerated and yet the photo of them in the evacuation helicopter at Alola show the fellow in sandals and not even a bandaid on his feet."
Mr Lynn said the clothes the pair were wearing in the helicopter were also recognised as the same as the ones they had on at the start of the trek.
The famous walk is crucial to PNG's small tourism industry and for the economy of the villages along the route.
Kokoda locals call for answers
The reported rape and robbery attracted international headlines and sparked fears of a collapse in trekker numbers.
A front page article in British tabloid The Sun referred to the alleged attackers as cannibals, which offended many people in PNG.
Most people in the area where the attack took place are strict Seventh Day Adventists and therefore vegetarian.
Mr Lynn said contrary to suggestions locals and tour operators would want to stay quiet until the turmoil passed, everyone was keen to have the incident properly investigated.
"They are fully aware of the international damage it's done to their image, but more than that there is a very large and expanding educated middle class in Papua New Guinea, and they are very proud," he said.
"Then to have a couple of blow-ins come who know nothing about the place, and then to have the international label of cannibalism put upon them, they are very angry about it."