The video showed a dozen law enforcement officers, including one wearing an FBI jacket, stopping at the home in North Port, Florida on Monday.
According to local media reports, Mr Laundrie’s parents were seen getting into a police van while the house, which they own, was searched. The FBI office in Tampa said in a tweet that it was serving a search warrant.
Ms Petito, 22, disappeared after she and Mr Laundrie, 23, hiked across the country in a converted van to visit national parks in July.
They had an argument along the way and Mr Laundrie was alone when he got into the van at his parents’ house in North Port on September 1 – making him a “person of interest”, police said.
Mr. Laundrie and Ms. Petito lived with her parents before making the trip.
It comes after a police search for Mr Laundrie was launched over the weekend. His the family reported her missing, relatives who told officers they had not seen him for three days.
On Sunday, the FBI announced the discovery of a body on the edge of Grand Teton National Park in Wyoming, which the couple had visited.
“Full forensic identification was not done to 100% confirm that we found Gabby, but her family has been notified,” FBI agent Charles Jones said.
“It’s an incredibly difficult time for [Petito’s] family and friends. “
Ms Petito’s father, Joseph, posted on social media an image of a broken heart above a photo of his daughter, with the message: ‘She touched the world’.
An autopsy is scheduled for Tuesday and a lawyer acting as a spokesperson for the family asked in a statement that they be given an opportunity to mourn.
Mr Jones said investigators were still seeking information from anyone who might have seen Ms Petito or Mr Laundrie.
A weekend search of the Florida nature reserve failed to find Mr Laundrie, North Port police said.
They said in a statement that they “have exhausted all possibilities to search the grounds” of the 24,000-acre Carlton Reservation in Sarasota County.
Investigators focused on the area where Mr Laundrie’s parents told police he may have visited.
Ms Petito’s family on Long Island in New York begged the Laundrie family to tell them where their son last saw her.
She and Mr. Laundrie were childhood sweethearts who met growing up on Long Island.
Video released by the police in Moab, Utah, showed that an officer stopped the couple’s van on Aug. 12 after it was seen speeding up and hitting a sidewalk near the entrance to Arches National Park. The body camera video showed an upset Ms. Petito.
Mr Laundrie said on video the couple got into a fight after getting into the van with dirty feet.
He said he did not want to pursue a domestic violence charge against Ms Petito, whom the officers decided to be the perpetrator.
Moab police separated the couple for the night. Mr. Laundrie went to a motel and Ms. Petito stayed with the van.