The FBI executed a search warrant Monday at Brian Laundrie's home in Florida, removing evidence and towing away a car as they search for answers in the Gabby Petito case.

Agents showed up to the home around 10 a.m. and at one point led Laundrie's parents into a vehicle. The couple has now been able to return to the home.

Police released a copy of the search warrant, which mentioned a computer hard drive and an 'odd' text message that Petito's mother received on August 27. In the text, Petito's mother said the person referred to Gabby's grandfather as 'Stan,' but she says Gabby never used that name when referring to him.

Neighbors Bill and Charlene Guthrie say they watched the scene unfold before their eyes. "We just saw a lot of chaos. It was something we've never seen before," they say.

The FBI tweeted later Monday that it had concluded its search of the Laundrie residence.

This all comes after the FBI announced Sunday that a body was found in Wyoming matching Gabby's description. An autopsy is set to take place on Tuesday.

Petito and Laundrie were traveling cross country in a van. Petito stopped communicating with her family on Aug. 25 and Laundrie returned home to Florida Sept. 1.

Guthrie says he found it strange how Laundrie acted like nothing happened when he returned home.

"It's very strange," says Guthrie. "Since he came back on the 1st it was like a normal day. Mother and son took a bike ride together around the neighborhood. Helped his father do some repairs around the garage."

Laundrie is now missing and hasn't been seen or heard from since last Tuesday.

LIVE BLOG: Updates from the Gabby Petito case

Laundrie is a person of interest in the Petito investigation, and his current whereabouts remain unknown.

The FBI and North Port police have not released any further details on the case.