DETECTIVES have been scouring the national DNA database today amid speculation that the second set of human remains found in a field near Eastleach are those of a young Vietnamese immigrant.

The whereabouts of 20-year-old Hai Nguyen have been unknown since she went missing from her temporary home in Swindon in June 2005. It was assumed she had moved to London to seek work after arriving in the country in 2003.

Police are refusing to reveal who they believe the body parts belong to but say they could belong to a woman aged between 23 and 30.

Detective Superintendent Steve Fulcher said the team from Wiltshire Police have been told they are those of a woman abducted in Swindon between 2003 and 2005.

The remains were found by officers excavating the Gloucestershire field - around 17 miles from where Sian O'Callaghan's body was discovered.

Police have now concluded their excavation of the site.

A single bouquet of flowers and a cross now stand in the field with the message ‘To an unknown lady, now you can rest in peace’ and is signed on behalf of Thames Valley and Wiltshire Police.

Missing person cases in the area where no body has been found include college worker Linda Razzell, 41, who disappeared from Swindon in 2002.

Her husband, Glyn, was convicted of her killing but protests his innocence.

Across the border in Gloucestershire, the body of Kate Prout has never been found after she went missing from her farm in 2007. Her husband, Adrian, was found guilty of her murder last year.