An undeveloped camping area on the east side of Grand Teton bordering national forest land will remain closed until further notice while the investigation continues.
FBI Supervisory Special Agent Charles Jones said investigators were still seeking information from anyone who may have seen Gabby Petito or boyfriend Brian Laundrie around camping sites in the area of Spread Creek, where law enforcement search efforts focused over the weekend.
The pair left in July on a cross-country trek in a converted van to visit national parks in the US West.
Mr Laundrie was alone when he drove the van back to his parents’ home in North Port, Florida, on September 1, police said.
More than 50 law enforcement officers on Sunday started a second day of searching for Mr Laundrie at the more than 24,000-acre (9,712-hectare) Carlton Reserve in Sarasota County, Florida, a wildlife area with more than 100 miles (160 kilometers) of trails, as well as campgrounds.