The update came on Sunday at a press conference held by the FBI and the United States National Park Services.
Gabby Petito still missing, police search for fiancé in reserve near Gulf Coast
Petito, 22, has not been seen since her fiancé, Brian Laundrie, 23, returned home to Florida after traveling across the country without her.
She was last seen in Salt Lake City, Utah, as she exited a hotel.
Police body camera footage shows Gabby Petito, her fiance arrested before she went missing
Laundrie initially refused to cooperate or speak with authorities about Petito’s disappearance and he has since been named a “person of interest” in the investigation.
Laundrie’s family said he too was missing on Friday.
Dr Brent Blue of the Teton County Coroner’s Office in Wyoming told Reuters and CNN on Sunday that they had not yet fully identified the remains.