Forensic experts are working around the clock in search of evidence after two more bodies were found near Ipswich.
Lights have been rigged up to allow teams to work around the clock
White, domed tents covered the bodies of what are thought to be missing women Paula Clennell and Annette Nicholls.
The pair were dumped in a secluded wooded area in the village of Levington in Suffolk after being killed elsewhere, Suffolk police have said.
A cordon has been put up between the tents to prevent cross-contamination of evidence.
The tents stand a few feet from the road, about 150 yards from each other, and are obscured by trees.
Forensic experts, clad in white suits, have taken pictures of the scene.
Lights on tripods have also been rigged up in the road to provide the teams with lights to enable them to work around the clock to collect as much evidence as possible.
The bodies were found close to one another
The tents are visible to motorists using the nearby A14, as the bodies lie about five ft from the road.
Det Ch Supt Stewart Gull said: "What we are dealing with appears to be deposition sites."
Police searchers are expected to spend several days at the scene.
Detectives said specialists would scour every inch in the hope that the killer had made a mistake which would give investigators a clue to his identity.
Villagers use the road to make their way into Ipswich or to Felixstowe 10 miles away.
Police have linked the discoveries of the bodies to the murders of Gemma Adams, 25, Tania Nicol, 19, and Anneli Alderton, 24, who were found dead in nearby villages within 10 days of each other.