Detectives in Britain say they have had more calls from the public following the release of CCTV images of one of five women murdered in Suffolk by a suspected serial killer.
Police say the footage of 24-year-old Anneli Alderton on a train on 3 December is the last confirmed sighting they have of her. The images give a clear indication of what she was wearing.
A week later her body was found in woods at Nacton near Ipswich last Sunday.
Police also confirmed that she had been three months pregnant.
Det Chief Superintendent Stewart Gull said the investigating team was checking the sex offenders register for possible leads.
Earlier, police investigating the five murders said they have been able to draw up a list of fewer than 50 suspects. They said they had the 'edges' of the jigsaw in place.
Officers have received nearly 7500 calls from the public offering information.
Alastair McWhirter, Chief Constable of Suffolk, said his officers were determined to carry out a 'thorough and quick' investigation.
A murder inquiry was launched on 2 December when the body of Gemma Adams, 25, was found.
On 8 December the body of Tania Nicol, 19, was discovered; on 10 December the body of Anneli Alderton, 24, was found; and on 12 December the bodies of Paula Clennell, 24, and Annette Nicholls were discovered.
Police say all five women were naked and all were found in isolated locations near villages south of Ipswich.
Today, Conservative Leader David Cameron said the recent killings highlight the dangers posed by drugs, and the lack of treatment available for addicts.
Mr Cameron says something will have to be done to clean up the streets of England.
