Police investigating the murders of five women in Suffolk have questioned drivers in an area where one of the victims, Paula Clennell, was last seen.
The 24-year-old is thought to have been on Handford Road, Ipswich, a week ago.
Meanwhile, the release of CCTV images of another victim, Anneli Alderton, on Saturday, led to 60 calls to police.
The police have declined to confirm or deny newspaper reports that a senior officer had been a client of two of the prostitutes killed in Ipswich.
Assistant Chief Constable Jacqui Cheer told the BBC: "We've said repeatedly that we have not interviewed anybody. We have spoken to a number of people.
"I'm not prepared to be drawn into how many and who and what types of people we are speaking to."
Motorists travelling along the Handford Road were asked if they were in the area a week ago, where Miss Clennell is believed to have worked.
Her naked body was found in woodland at nearby Levington on 12 December.
The other four murdered women are Anneli Alderton, 24, Gemma Adams, 25, Tania Nicol, 19, and Annette Nicholls, 29, who all worked as prostitutes.
Det Ch Supt Stewart Gull said none of the murdered women had suffered "self defence wounds", nor had any of the women showed any evidence of sexual assault.
On Saturday, police released CCTV images showing a train journey taken by Miss Alderton on 3 December.
Mr Gull said 60 calls had been received by detectives as a result.
He added that Miss Alderton had left the Harwich to Colchester train at Manningtree station at 1815 GMT.
Satellite images of key locations
It is then believed she took a train to Ipswich at 1843 GMT, but officers appealed for people who were at Manningtree station around that time to come forward.
ACC Cheer said: "We have lots of new information that has come in overnight. That will now be analysed."
Miss Alderton caught the 1753 GMT train from Harwich to Colchester on 3 December - a week before her body was found near Ipswich.
Police said Miss Alderton was three months pregnant when she died.
On Saturday police appealed for help at the start of Ipswich Town's football match against Leeds United.
A minute's silence was held at Portman Road and prayers said for the dead women.
Police confirmed they were interested in speaking to 50 to 100 people.
POLICE PHONE NUMBERS
Some had been spoken to and some were still to be questioned, but no-one has been interviewed under caution about the murders.
More than 300 registered sex offenders in the county have also been contacted.
Detectives revealed they also want to speak to a man named as Andrew Purdy, 44, a property developer from Holbrook, who attended a memorial service for the five women in the company of a prostitute.
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