Police searching for missing US woman Gabby Petito find body

US police searching for a missing young woman in national parklands in the US state of Wyoming have found a body.

The Teton County Coroner Dr Brent Blue told CNN authorities are responding to a body found at the Grand Teton National Park, the same general area where law enforcement have been searching for 22-year-old Gabby Petito.

The FBI's Denver field office announced on Twitter that authorities would hold a news conference regarding Petito's disappearance this morning at 8am AEST in the national park.

READ MORE: A timeline of missing 22-year-old Gabby Petito's case

Gabby Petito

It is not known if the body is male or female.

Over the weekend police were also searching in Florida for Ms Petito's 23-year-old boyfriend Brian Laundrie, who has been named a person of interest in her disappearance.

Mr Laundrie and Ms Petito, 22, left in July on a cross-country trek in a converted van to visit national parks in the US West.

Police said Mr Laundrie was alone when he drove the van back to his parents' home in North Port, Florida, on September 1.

READ MORE: Gabby Petito argued with boyfriend before vanishing, bodycam shows

Ms Petito's family filed a missing persons report September 11 with police in Suffolk County, New York.

"It is important to note that while Brian is a person of interest in Gabby's disappearance, he is not wanted for a crime," North Port police said in a statement. It added that the investigation is now a "multiple missing person" case.

Mr Laundrie's family members told investigators that the last time they saw him was on Tuesday when they believe he went to the wildlife reserve in the Sarasota area.

Ms Petito's family had been pleading for the Laundrie family to tell them where their son last saw her.

Gabby Petito

Ms Petito and Mr Laundrie were childhood sweethearts who met while growing up on Long Island, New York. His parents later moved to North Port, about 55 kilometres south of Sarasota.

The couple's trek in the Fort Transit van began in July from Long Island. They intended to reach Oregon by the end of October according to their social media accounts, but Ms Petito vanished after her last known contact with family in late August from Grand Teton National Park in Wyoming, authorities said.

The van Gabby Petito and Brian Laundrie were travelling in.

The FBI in Denver said Saturday that agents have begun conducting ground surveys at Grand Teton National Park, with help from the National Park Service and local law enforcement agencies, seeking clues to Ms Petito's disappearance.

FBI agents tweeted that they were focusing on an undeveloped camping area near Spread Creek on the east boundary of the park, which was closed to the public during the surveys.

They urged anybody who had been there between Aug. 27 and 30, and had seen Ms Petito, Mr Laundrie or their vehicle, to contact them.

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