The body of a woman matching the description of Gabby Petito has been found by search crews at a national park in the US state of Wyoming.
“As every parent can imagine, this is an incredibly difficult time for her family,” FBI agent Charles Jones told the media.
“The cause of death has not been determined,” he added.
Ms Petito, 22, was visiting the Grand Teton National Park with her fiancé, Brian Laundrie, when she disappeared.
Mr Laundrie was declared a “person of interest” in the case, but not charged with any crime. He declined to speak to police, and disappeared a few days later.
The FBI said that while forensic examinations were yet to “confirm 100%” that the human remains were those of Ms Petito, they were consistent with her description.
Ms Petito’s father, Joseph, posted a photo of his daughter on Twitter shortly after the news conference.
— joseph petito (@josephpetito) September 19, 2021
Mr Laundrie and Ms Petito set out on a cross-country campervan trip in July, documenting their adventures on social media.
But on 1 September, Mr Laundrie returned home alone. Ms Petito’s family later reported her missing.
A search team spent the weekend scouring a 25,000 acre wildlife reserve in Florida looking for Mr Laundrie with police dogs and drones, but as of Sunday evening nothing had been found.
Thousands of comments have been left on the couple’s Instagram pages, and protesters gathered outside the Laundrie family home on Friday yelling “where’s Gabby?”
At the news conference on Sunday evening, Mr Jones said the tips police had received from the public had been “remarkable” and renewed the call for anyone with information to come forward.
Two weeks before Ms Petito went missing, on 12 August, police in the southern Utah town of Moab were called to a possible domestic violence incident involving the couple.
Police released bodycam footage which showed Ms Petito crying and complaining about her mental health to officers. She also said the couple had been arguing more frequently.
The officers recommended they spend the night apart but did not file any charges. It is not yet known what happened next.