Human remains found in the US state of Florida have been identified through dental records as those of Brian Laundrie, the boyfriend of murdered woman Gabby Petito, the FBI has said.

The partial remains were found yesterday in a wilderness area where authorities were searching for Mr Laundrie since he was reported missing by his family in mid-September.

Ms Petito's disappeared during a cross-country road trip with her boyfriend.

The 22-year-old was last been seen alive on 26 August.

Her body was discovered near the remote Spread Creek Dispersed Campground in Bridger-Teton National Forest in western Wyoming.

Medical examiners found that she had been strangled.

Ms Petito and Mr Laundrie, who lived with his parents in North Port on Florida's west coast, embarked on their trip in early July from New York's Long Island, where her parents live.

As they travelled through Kansas, Colorado, Utah and points west, Ms Petito documented their "van life" on social media with videos and pictures that depicted a loving couple having an American adventure.

She posted her final photo to Instagram on 25 August, the same day she last spoke to her mother by phone.

Police in Utah released a video last month of an August encounter with the Florida woman tearfully describing a dispute she had on a road trip with her boyfriend, who was named a person of interest in her disappearance.

On 23 September, a federal grand jury in Wyoming indicted Mr Laundrie on a charge of fraudulently using Ms Petito's bank debit card between 30 August and 1 September to spend $1,000 or more.

He had not been charged in relation to her death.