Detectives investigating the murder of Sian O'Callaghan are still working to establish the identity of a set of human remains found at a second site.

Wiltshire Police have been scouring the national DNA database but have warned if no matches are found it could take "some time" to identify the woman.

Excavation work had been taking place at the site at Baxter's Farm in Eastleach, Gloucestershire - around 17 miles from where Sian O'Callaghan's body was discovered.

Flowers have been laid by the officers involved in the case next to a wooden cross, with the message: "To an unknown lady, Now you can rest in peace."

A police spokeswoman said: "We can confirm that work to recover a second body at Eastleach has been completed and the scene released.

"Forensic investigations to establish the identity of this young woman are ongoing using DNA and the speed of this identification process relies on whether or not we have her DNA on a database.

"If we don't get a DNA match further investigations will need to be carried out which may take some time.

"The public can be assured that we will of course inform the victim's family wherever possible before releasing any details in the media."

Speculation yesterday pointed to a young Vietnamese immigrant, Hai Nguyen, 20, who went missing from her temporary home in Swindon in June 2005.

Locals 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 , who was abducted in Swindon between 2003 and 2005.

The force has no outstanding missing women from that period.