According to reporters on the scene of the North Port residence, several FBI agents "towed away" Brian's silver convertible Mustang from his parents' driveway on Monday afternoon, while others transported numerous boxes filled with potential evidence from the house to one of their vans – all in the midst of a downpour.
Christopher and Roberta told authorities that they found a note from police left on their "missing" 23-year-old son's car last Wednesday while it was parked near the Carlton Reserve in Sarasota County, where he allegedly began a solo hike the day before and never came back.
The note had asked for the car to be removed, but the family said they left the vehicle there until Thursday in the hope that Brian would return to it.
They reported him missing on Friday, despite not having seen or heard from him since Tuesday. He was declared a "person of interest" on Wednesday.
As RadarOnline.com previously reported, Christopher and Roberta were detained earlier today after their home was swarmed by about a dozen FBI agents who had obtained a search warrant.
The Laundries appeared to comply with orders to leave the premises and get into a van, where they were joined by one of the agents. Meanwhile, other agents were seen bringing equipment and pink evidence envelopes into the couple's residence.
One reporter who was on the scene said the Laundries eventually went back inside their house.
This all comes just one day after the body of a woman investigators believe to be Brian's missing 22-year-old fiancée was discovered in Wyoming's Bridger-Teton National Forest.
Though an autopsy is scheduled for Tuesday of this week, authorities said the body was "consistent with the description" of Gabby.
On July 2, Brian and Gabby – high school sweethearts from Long Island – hopped into their white 2012 Ford Transit and embarked on a cross-country road trip to tour various state parks. They began their trek in New York and were set to conclude in Oregon by Halloween.
Christopher and Roberta had since moved to North Port, where Brian and Gabby were living with them.
- Brian Laundrie's Parents Detained By FBI After Home Swarmed & Declared 'Active Crime Scene' Following Discovery Of Body In Gabby Petito Case
- Brian Laundrie's Parents Christopher & Roberta Seen For First Time Since Gabby Petito's Death Ruled A Homicide, Refuse To Answer Questions About Missing Son
- Gabby Petito's Possessions Are Allegedly 'Still In The Laundrie Home,' Which Was Declared A 'Crime Scene' Following The Discovery Of Her Body Amid Brian's Disappearance
Brian returned home alone in the couple's van on Sept. 1, prompting Gabby's family to report her missing 10 days later, on Sept. 11.
Brian immediately retained legal counsel and refused to assist investigators with their search of Gabby.
Though they had named him a person of interest, police previously said they did not have evidence to show that a crime had been committed and therefore could not bring Brian in for questioning.
Last week, authorities in Utah released body-camera footage taken in mid-August that captured cops responding to what an onlooker described as a "domestic dispute" between the now-missing couple.
In the hour-long video, Gabby sobbed continuously as she detailed having OCD and upsetting Brian, who she admitted to hitting during an earlier altercation.
No charges were pressed, but the couple did agree to spend the night apart.
On Monday, the 9-1-1 call that led to the police stop was released to the public.
In it, a male caller was heard describing a white van with Florida license plates and an allegedly violent encounter he saw take place between a male and female.
"We drove by and the gentleman was slapping the girl," the caller told the operator. When the operator reiterated, "He was slapping her?" the caller reiterated, "Yes, and then we stopped. They ran up and down the sidewalk. He proceeded to hit her." The caller said the couple then drove off.
The day after the police stop in Utah, Brian posted a series of photos of himself at Arches National Park (near where the couple was pulled over) with a lengthy and bizarre caption that began, "Humans are primates, great apes in fact but I don't know all how great we are as a species."
Gabby's last post was dated Aug. 25. It was a series of pictures showing her smiling and posing in front of the Monarch Mural in Ogden.
Eagle-eyed TikTokers have also pointed out that Brian was seen reading a book about women who go missing while on the couple's road trip.