Authorities swarmed the home of Brian Laundrie's family and temporarily removed his parents from the residence.
Police also declared a crime scene at the home in North Port, Florida, reports said.
Laundrie remains missing and a body believed to be of his fiancée Gabby Petito was found in Wyoming on Sunday.
Authorities, including the FBI, swarmed the Florida home of Brian Laundrie's family on Monday and temporarily removed his parents from the residence, declaring the house a crime scene a day after a body believed to be Laundrie's fiancée, Gabby Petito, was found.
"The FBI is executing a court-authorized search warrant today at the Laundrie residence in North Port, FL relevant to the Gabrielle 'Gabby' Petito investigation," the FBI's Tampa office tweeted on Monday.
Police on Monday declared a crime scene at the North Port, Florida, home where Laundrie and Petito lived with his parents, Fox News reported.
As authorities cordoned off the area and placed yellow police tape at the scene moments before the FBI arrived, officers told people, "You're in a crime scene," the outlet reported.
About 15 FBI agents and North Port police officers raced into the home, WFLA-TV reported.
Reporters at the scene said they saw Laundrie's parents being led out of the home by authorities and placed in an unmarked van in the home's driveway as authorities searched the residence.
The parents, Christopher and Roberta Laundrie, later went back inside the property after spending at least an hour inside the van, according to Fox News.
Hours into the search of the home, investigators were seen carrying large, flat cardboard boxes into the residence. Some officers were also seen bringing apparent evidence bags inside the property.
At one point, a tow truck removed a Ford Mustang that was parked at the home. That same vehicle was reportedly driven last week by Brian Laundrie to the nearby Carlton Reserve before his parents went and picked up the car after he did not return home.
Brian Laundrie remains missing after his parents told authorities on Friday that the 23-year-old left to go on a hike at the nature preserve earlier last week and never returned home.
Florida police said earlier on Monday that they have "exhausted all avenues" in searching the sprawling grounds of the 25,000-acre Carlton Reserve for Laundrie, and that authorities had no plans to conduct "a major search" there on Monday.
"Law enforcement agencies continue to search for Brian Laundrie," North Port police spokesman Josh Taylor said in a statement.
The Laundrie family attorney, Steven Bertolino, would not comment to Insider on the FBI raid of the family's home Monday but said he will be holding a press conference Tuesday at 1 p.m.
The latest development in Petito's disappearance came after authorities said on Sunday that they found a body at a campsite near Wyoming's Grand Teton National Park believed to be Petito. An autopsy to confirm the identity of the remains is scheduled for Tuesday.
The discovery of the human remains was made more than a week after the 22-year-old woman was reported missing by her family in New York.
Police named Brian Laundrie a person of interest in Petito's disappearance after the couple went on a cross-country road trip out West to national parks in a white converted camper van on July 2.
He returned home to Florida with the van and without Petito on September 1, police said.
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