Reinforcements have been drafted in to help the small Suffolk police force in its largest inquiry.
A statement from the office of Tony Blair, the British prime minister, said it had been in touch with police to ensure all necessary resources were available.
Mike Berry, a criminal psychologist, said the killer was an exceptionally cold-blooded and skilful operator.
“The killer may be confident he will not be caught,” he wrote in the Daily Mirror. “He will be fascinated by the coverage of the case … he will be thinking ‘the game is on’.”
A huge police inquiry began on December 2 when the body of Gemma Adams, 25, was found in a stream near Ipswich. Police found 19-year-old Tania Nicol’s body in the same stream on December 8.