THE killer of the unidentified woman found burning near Wooburn Common would have found it impossible to clear every speck of evidence from the murder scene, police say.

The woman, who was bludgeoned to death then set on fire in woods off Hedsor Lane two weeks ago, would have been bleeding so much detectives think the killer will have left evidence behind.

Detective Superintendent Andy Taylor, leading the investigation, said: "The offender will have blood-stained clothing, there would have been a significant amount of blood at the scene.

"Even their best efforts to cover their tracks would give us a chance for the forensics team."

As yet the identity of the victim remains a mystery. Her body was discovered on fire by a dog walker on Saturday, July 29.

CCTV images showing her alive less than 24 hours before her body was discovered have been released.

The woman was captured by cameras at Leytonstone tube station in east London at 11.30pm on Friday, July 28.

Scientific analysis of her body has revealed she was white, 21, and had shoulder length brown or henna coloured hair.

She was wearing a limited edition lemon Adidas top with the lettering "on fire" across the front. Remnants of a red fleece were also found at the scene, which may have been covering her head.

Some other as yet unidentified material was also found, which the police believe her body was wrapped in when it was set alight with petrol.

Her body was still smouldering when police arrived on the scene.

Det Supt Taylor said it was hard to tell what sex the victim was when they first arrived as the lower body was so badly burnt.

"I have never seen anything quite like this," he said.

The main aim for the team of 31 officers is to identify the woman to track her killer.

The team are searching missing persons reports, known abused wives and have circulated her picture to sex workers in the area.

"We are looking at prostitutes. We have had some very good information from sex trade workers," Det Supt Taylor said.

He added that the pegasus rampant tattoo on her upper arm, pictured above, is very popular in Albania because it has mystical symbolism.

It has also been discovered that it is hiding three letters beneath its wing.

Police are also considering that she may have been an illegal immigrant from eastern Europe, making it much harder to trace her.

Det Supt Taylor said: "The team of scientists are enthused by the job, they have been so helpful. They offer the best chance of identifying the victim."

A man who was arrested in connection with the murder was released without charge on Wednesday. Police confirmed he has been eliminated from the enquiry.