Police investigating the murders of two Ipswich women say the body of a third woman is also that of a prostitute.
Tania Nicol, aged 19, disappeared on 30 October
The woman's body was discovered by a walker on Sunday afternoon in trees at Nacton, about two miles outside the Suffolk town.
Police said it was too early to link the death to those of Gemma Adams, and Tania Nicol, who were found two miles apart in the same stretch of water.
Detectives said the discovery was being treated as an "unexplained death".
Ms Adams, 25, and Ms Nicol, 19, worked together and went missing from the red light area of Ipswich.
Ms Adams vanished on 15 November and her body was found in a stream at the village of Hintlesham, Suffolk, on 2 December.
Ms Nicol disappeared on 30 October and her body was discovered on Friday in the same stream at Copdock, near Ipswich.
Both were found naked and Det Supt Andy Henwood said they were treating the deaths as "linked investigations" and that there were "obvious similarities" between the disappearances and subsequent deaths.
He said it was "very rare" to have a linked murder investigation and they were now reliant on information from the public to help move the inquiry forward.
The Reverend Andrew Dotchin, vicar of Whitton, Ipswich, who knew Ms Nicol, said people were very worried.
He said: "I think there is a great deal of concern that a serial killer is at large.
"There is a sense of concern for our town, a sense of concern for the girls that are still on the street."
Mr Dotchin said he came into contact with Ms Nicol about two years ago.
He said: "She was one of a number of youngsters who used to gather near the church. That was how I got to know her.
"For the little time I knew Tania I got a sense that she was a girl who was frightened about how her life was going to turn out."
Gemma Adams was last seen on 15 November
The third body was found by a woman out walking in a wooded area just off the A14 about two miles outside Ipswich.
Post-mortem examinations have been carried out on both murdered women but police said more tests were now needed and these could take up to six weeks.
Detective Chief Inspector John Quinton said there was no evidence either woman had been sexually assaulted and there were no obvious signs of injury.
The clothing worn by the two women on the nights they went missing has yet to be found.
Det Ch Insp Quinton said Suffolk detectives were liaising with colleagues in Norfolk where police had investigated the murder of three prostitutes in recent years and the disappearance of a fourth.
Police have also appealed for the clients of both Ms Nicol and Ms Adams to come forward.