Laundrie and Petito, 22, left in July on a cross-country trek in a converted van to visit national parks in the U.S. Her last known contact with family members was from the national park known for its mountainous terrain. Meanwhile, the FBI in Denver said Saturday that agents were conducting ground surveys at Grand Teton National Park in Wyoming, with help from the National Park Service and local law enforcement agencies, seeking clues to Petito's disappearance. 'His family says they believe he entered the area earlier this week,' North Port Police tweeted Saturday. Investigators took some of his clothing from his parents' home Friday night to provide a scent for the search dogs. More than 50 North Port police officers, FBI agents and members of other law enforcement agencies searched the 24,000-acre (9,712-hectare) Carlton Reserve in the Sarasota, Florida area of the Gulf Coast.Īuthorities used drones, scent-sniffing dogs and all-terrain vehicles in the reserve, which has more than 100 miles (160 kilometres) of trails, as well as campgrounds. Police searched a vast Florida wildlife reserve on Saturday for 23-year-old Brian Laundrie, a person of interest in the disappearance of his girlfriend, Gabrielle 'Gabby' Petito, while across the country the FBI hunted for clues about the missing woman in a mountainous national park in Wyoming.