Detectives investigating the murder of Hampshire woman Joanna Yeates are examining a series of clues suggesting she may have met her fate at home, amid reports the landscape architect's body was found with no coat or shoes and only one sock.

It has also emerged that the 25-year-old openly discussed the fact she would be spending the weekend alone as her boyfriend was away.

Jo was last seen walking home to her rented flat in the Clifton area of Bristol after going for drinks with colleagues on December 17.

Her snow-covered body was found on Christmas Day in a lane three miles from her home. She had been strangled.

According to reports today Jo's shoes and coat were found in her flat but the grey sock is missing, prompting theories that it could have been kept as a ''trophy''.

The paper reported she may have been abducted or killed in the flat and her body dumped, with a source telling the paper it was ''highly unlikely'' she would have gone out without shoes and a coat on a cold winter night.

Meanwhile, a friend is today reported to have told how Jo had spoken about looking forward to baking mince pies and having the weekend to herself while boyfriend Greg Reardon, 27, was away.

Police will provide an update on their progress in the investigation today as CCTV images also emerged which could show some of her last movements.

A national newspaper has published footage apparently showing Jo, originally from Ampfield, near Romsey, during her walk home on December 17 with a Tesco carrier bag - followed seconds later by two people.

It comes after officers suggested that more than one person may be responsible for her death, and the launch of a national appeal on Facebook for witnesses.

With the murder probe continuing, police have said they are still in the dark about when and where she died.

Yesterday crime scene investigators were at Jo's flat, using advanced forensic techniques to examine the scene for fingerprints.

There was a sign outside the building in Canynge Road saying ''Do not enter, dangerous chemicals''.

A number of uniformed officers also entered the flat of Jo's landlord Chris Jefferies, on the opposite side of the building.

Mr Jefferies, the only person to be arrested as part of the investigation so far, was freed on police bail pending further inquiries.

The 65-year-old was detained last Thursday on suspicion of murder and held until Saturday night, when he was released.

Officers have been trawling through scores of hours of CCTV as part of the probe.

The footage published in the Mirror apparently shows Jo on her walk home at 8.44pm on December 17. This was after she bought a Tesco pizza, no trace of which has since been found.

Another image timed 27 seconds later shows two people walking in the same direction.

An Avon and Somerset Police spokesman told the paper they could not confirm the earlier image was of Jo, but said the footage would be investigated.

The force has placed an advert on Facebook in the hope of producing more leads.

Detective Chief Inspector Phil Jones, who will make a statement about the probe later in Bristol, said: ''The majority of people these days are spending time on Facebook and other social networking sites. This has become part of everyday routine for many people.

''This advert allows us to point people to special features on our website with all the latest information, it allows them to contact the incident room direct online rather than calling in.

''I would once again urge anyone who may have not contacted my team and may have information that could help this inquiry to contact us. Let us decide if this information is significant.''

Avon and Somerset Police have successfully used Facebook in several other high-profile cases.

It is a more cost-effective method than poster campaigns and mass leaflet distribution and, due to the viral nature of Facebook, can be shared much wider.

Police have said they found no evidence that Jo was sexually assaulted while also suggesting that more than one person may be responsible.

Detectives are appealing for help in tracing a 4x4 vehicle seen near the spot where her snow-covered body was discovered in Longwood Lane, Failand, north Somerset.

But they also revealed that they still do not know the circumstances of her her death.

Mr Jones told reporters: ''I am satisfied that Jo got back to her flat but I'm not able to speculate whether she let somebody into the flat, whether somebody was already in there or whether someone broke into the flat.

''At this time I cannot say where or when Jo was killed, or when her body was left on Longwood Lane.

''The significant snowfall in the early hours of Saturday December 18 has a considerable impact on this and I am working with numerous forensic specialists to determine the timings.''

While the killer remains at large, police have warned women not to walk home alone.

Increased patrols are being maintained to reassure the public in the upmarket Clifton area where former Embley Park pupil Jo lived with her boyfriend.

But officers have said there was nothing to suggest the murderer was a serial killer or that people should be unduly worried.

Miss Yeates was last seen on the evening of Friday December 17 after she had been drinking with colleagues in The Ram pub in Park Street.

Her body was found by a couple walking their dogs on Christmas morning.