THE Gabby Petito and Brian Laundrie case has sparked a string of wild conspiracy theories as it consumed national attention over the last month.

Internet sleuths have pushed a number of theories on social media from Gabby being pregnant to Laundrie hiding on a boat or in a bunker in his parents' flower bed.

The 22-year-old travel blogger was first reported missing on September 11 and even before her remains were found in Wyoming eight days later, social media users speculated that she was murdered.

The disappearance of her 23-year-old fiancé on September 17 sparked an even more intense wave of speculation as sleuths dug into Laundrie's past to unearth what they believed were clues into where he may be hiding out.

It also unleashed a wave of sightings and claims that he was staying in contact with his parents through code.

'LETTERS TO PARENTS'

A former fugitive has claimed that Brian Laundrie could be mailing letters to his parents using code words to evade police capture.

Seth Ferranti spent two years on the run in the early 1990s and was previously on the US Marshals’ most wanted list. 

While there is no evidence the Laundries are in any contact with their son, Ferranti told The Sun "it is definitely possible" for fugitives to use “letters in the post” to communicate with loved ones.

"It is a way to keep up communication and let his parents know he is ok," Ferranti added.

Ferranti, who disappeared between 1991 and 1993 after facing nonviolent drug trafficking charges, added: "If Brian spoke to his parents before they could have chosen code words."

Read our Gabby Petito live blog for the very latest news and updates…

Chris and Roberta Laundrie did not report their son missing until September 17, telling police they had last seen him on September 14.

It later transpired Laundrie had been missing since September 13 after it was revealed his parents gave the incorrect date for when he allegedly disappeared into the Carlton Reserve.

He had returned home from his cross-country trip without fiancée Gabby Petito on September 1.

'DOOMSDAY BUNKER'

Other sleuths having wildly speculated that Laundrie never left his family home and is hiding in a Doomsday bunker in their flower bed.

Amateur detectives have suggested that he might be hiding out at the Florida home he shared with Gabby Petito and his parents.

Facebook users have discussed whether Brian could have built a DIY underground bunker, sharing a clip of how it could be done.

One wrote: "Is this what's below the garden beds?

"The wood would help absorb the moisture. Thoughts?"

Online sleuths had already bizarrely claimed they noticed a white-colored square pit in the garden, fueling allegations that Laundrie may be hiding in an underground bunker.

There is no evidence to support any of these claims.

That came after earlier footage shared by sleuths appeared to show a woman, who they claim to be Laundrie’s mom, gardening and working on one of her flowerbeds.

A man, who online detectives say is the fugitive’s dad, appears to be standing by watching.

Social media sleuths also wildly alleged that they could see a “hand” emerge from underneath the flower bed.

One said: "That really looks like a hand in the flowerbed."

Again, there is no evidence to support any of these claims.

Other social media users were skeptical as they suggested the woman was pulling out a weed from the flowerbed.

'CHARTER TO COSTA RICA'

As alleged sightings of Laundrie reached their peak in the days after his disappearance, some online claimed that he may have headed to Costa Rica.

Reddit users wondered where Laundrie could be hiding on the r/Gabby Petito General Discussion thread – with some claiming he could be long gone from the country.

"At this point, I'm guessing private charter to Costa Rica or similar," one person said.

"The Mustang was a plant. Who ever [sic] drove it (most likely dad) walked back home via Big Slough."

This unconfirmed claim was an apparent reference to the silver Mustang seized by the FBI on September 20, which Laundrie reportedly drove to Myakkahatchee Creek Environmental Park the day he went missing.

However, others dismissed this theory and pointed out that Laundrie's face was "all over the news" in South America, meaning he would be recognized by people there.

'HIDING IN A BOAT'

Another wild theory internet sleuths are peddling is that Laundrie may be hiding on a boat to evade police.

The theory, which gained traction on Twitter, appears to be born out from an unfounded claim that Laundrie went live on Instagram for a matter of seconds on September 20.

A clip circulating on Twitter appeared to show a body of water and the side of a green vessel before abruptly cutting out.

Viewers of the clip are attempting to claim that Laundrie "accidentally" went live on Instagram before realizing and hastily cutting off the feed.

The theory he may be hiding on a boat first began circulating the same day police called off a search for Laundrie in Carlton Reserve, claiming they had "exhausted all leads."

It has since been revived and Dog the Bounty Hunter has mounted his own search in Fort De Soto Park after reportedly receiving a tip Laundrie was there.

'SENT POSTCARDS AS GABBY'

Online sleuths have also claimed that Laundrie pretended to be Gabby in postcards written to his nephews.

Laundrie has already been accused of using her bank card to spend $1,000 on his way back to Florida alone.

A warrant was issued for his arrest on September 24.

People following the case have pointed out that handwriting on postcards all allegedly sent by Gabby to members of Laundrie's sister Cassie's family appears to differ.

The cards are signed off from "Aunt Gabby," but online sleuths believe some may have actually been written by Laundrie himself following Gabby's death.

This is because, they claim, the handwriting is different and some do not appear to have postage on – leading to sleuths asking how they got to Laundrie's sister Cassie.

On one postcard from Arches National Park, there are drawings of rocks allegedly by Gabby – but sleuths have questioned whether she actually drew them.

"Gabby was a talented artist," one sleuth said.

"Seems she could do much better than this."

It comes after online sleuths claimed Laundrie wrote Gabby's final Instagram posts.

Gabby's supporters have highlighted that the second-last post made on her Instagram account was using pictures that were taken weeks before and that other lengthy captions were "not like her."

'GABBY WAS PREGNANT'

Wild claims have been made online that Gabby was pregnant after sleuths spotted a baby-themed Pinterest board and a "sonogram" on a dirt track in Wyoming where her van was parked.

The board titled "Oh Baby" was also shared by Brian Laundrie's mom, the International Business Times reports.

The page contains several links to items of clothing that were previously for sale including onesies and crocheted bibs.  

There are several snaps of toddlers playing on the beach and cute family photos.

One sleuth, who watched a video posted by travel bloggers Jenn and Kyle Bethune, shared an image that looks like a “sonogram.”

The "picture" was among several items by the roadside including what looks like a spiraled notebook.

It remains unknown if a "sonogram" was among the items found near the couple's van.

The claims that Gabby may be pregnant are purely speculation at this time.

It is not known if she was expecting a baby at the time of her death.

Gabby was reported missing a month ago today and the search for her fiancé continues.

Her manner of death was declared a homicide but the cause of death has not yet been revealed.

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