Gabby Petito and her boyfriend kept lists of campgrounds they wanted to visit around Grand Teton National Park

• The family of missing YouTuber Gabby Petito accused her boyfriend of leaving her "in the wilderness with grizzly bears and wolves."
• Petito and her boyfriend appear to have kept lists of campsites to visit on their road trip on a site called Dyrt.
• The lists include campgrounds near Grand Teton National Park, which is believed to be Petito's last known location.

Gabby Petito and her boyfriend kept a list of campsites to visit on the cross-country road trip they took this summer before Petito is believed to have disappeared near Wyoming's Grand Teton National Park.

Petito's boyfriend, Brian Laundrie, returned to their Florida home on September 1 without her. He has refused to speak with police about Petito's disappearance since her mother reported her missing on September 11, leading her family to accuse him of leaving Petito "in the wilderness with grizzly bears and wolves while he sits in the comfort of his home."

Police now consider Laundrie a person of interest in the case.

The couple appeared to keep lists of campgrounds across several states, including Idaho, Wyoming, and Utah, on an app called Dyrt. Dyrt is a social media network for campers where people share campground reviews, photos and camping tips.

Petito and Laundrie appeared to join Dyrt in July, the same month they started their road trip. The first post on the account was a July 22 review of a campground in Utah near the Dixie National Forest; the last post was a July 29 review of a campground near Arches National Park.

"Highly recommend taking a walk to watch the stars very late at night," the review said. "There is a spot past the tress if where the sky completely opens up, really nice spot in the shade to put tent! Got to watch a crazy thunderstorm in our newly converted van!"

Petito and Laundrie left their home in North Port, Florida, in early July for a road trip in their van that was supposed to end in Washington state. The couple documented their trip on social media, posting photos to their Instagram accounts as well as Dyrt.

Petito was last seen on surveillance footage checking out of a hotel in Utah on August 24. Her family said they last heard from Petito when she spoke to her mother over FaceTime on August 23 or 24. Her mother said she continued receiving texts from Petito until August 30, but she doesn't believe her daughter was on the other end of the phone.

The couple got into an argument before Petito was last seen, according to police. Police in Moab, Utah released body camera footage of an August 12 "incident" involving Petito and Laundrie in which Petito says the couple got into a physical altercation after she became upset that he wouldn't let her back into their van.

Petito's father recently flew to Wyoming to search for her, according to the family's attorney, as her last known location is believed to be in Grand Teton National Park.

The couple had a list on their Dyrt account called "CRATERS TO TETON" that includes three campsites spread throughout southeastern Idaho, ending near the border of Wyoming by the Caribou-Targhee National Forest.

A private investigator told Insider that since Laundrie has refused to speak to police and retained a lawyer, they believe he may have left her behind somewhere in Grand Teton National Park. Experts also suggested authorities look within one mile of Laundrie's home for a body, although police have said they have no evidence of a crime.

The likelihood of finding someone after they've been missing for two weeks in the wilderness is "minimal," another private investigator told Insider.