Police in North Port, Florida, resumed their search Tuesday for Brian Laundrie in the Carlton Reserve, while an autopsy is expected to be conducted to confirm the body found in a Wyoming park over the weekend is Gabby Petito as suspected. Petito vanished on a cross-country road trip with Laundrie, her boyfriend. Her mother reported her missing on Sept. 11, though the investigation has shown Laundrie returned home alone in their van 10 days before that. It also found Petito's phone had been off since Aug. 27. And now Laundrie is missing, too. He reportedly went to the nature preserve a week ago to go hiking. He hasn't been seen since and remains a person of interest in Petito's disappearance. A day ago, North Port police had said they felt they had exhausted all avenues of searching the nature reserve. It wasn't immediately clear what sparked the renewed search on Tuesday, but police for the first time called the case an "FBI-led criminal investigation" as they announced their plans to approach the sprawling preserve from a different side. #NEWS4NOW #NBC4NY