Federal authorities have discovered the remains of a body they believe to be Gabby Petito, 22, a blogger whose mysterious disappearance has fueled national intrigue and a cross-country effort to solve the complex and increasingly bizarre case. The FBI made the announcement Sunday afternoon, explaining law enforcement had combed through a camping area in Wyoming's Grand Teton National Park and found human remains that appear to be Petito. Authorities will conduct a full forensic review to verify the remains, according to Charles Jones, a special agent with the FBI's Denver office. "I would like to extend sincere and heartfelt condolences to Gabby's family," Jones said. "As every parent can imagine, this is an incredibly difficult time." Petito went missing while on a cross-country trip with her fiancé, Brian Laundrie, 23. She was last seen in Grand Teton National Park in late August. Laundrie returned home alone on Sept. 1 from the couple's weekslong trip, only to disappear himself last week. 📸 @apnews #findgabbypetito #findgabby #gabbypetito