OFFICERS in the Sian O'Callaghan murder investigation this afternoon revealed that the body found in Uffington was that of the missing 22-year-old.

Detective Superintendent Steve Fulcher told a press conference that there was no indication she was sexually assaulted but said that the family formally identified her last night.

He also said that the man arrested on suspicion of her murder confessed to killing another woman between 2003 and 2005.

He said that officers had sifted through a large amount of CCTV footage in the investigation and a camera in the High Street showed a car passing Sian and then turning back round and coming back to where she was.

This enabled officers to track the driver and arrest him.

Wiltshire Police were today granted more time to question the man being held in connection with the murder of Sian.

Officers made an application at Swindon Magistrates Court this morning to extend the time they can hold the 47-year-old taxi driver, believed to be Chris Halliwell of Ashbury Avenue, Nythe, who was arrested on Thursday morning.

The body of office worker Sian was found close to the Uffington White Horse in Oxfordshire the same day.

Wiltshire Police now have until 3.15am on Monday to question the suspect, they said this afternoon.

A force spokesman said: "The 47 year old man arrested on suspicion of kidnap and two murders appeared at Swindon Magistrates Court this morning where an application was made for a warrant of further detention.

"An extension was granted which will end at approximately 3.15am on Monday 28th March 2011. This takes into account the change to British Summer Time.

"The man remains in custody at Gablecross Police Station in Swindon."