The girls' bodies were found in a ditch in a remote spot near Lakenheath airbase on 17 August 2002, almost two weeks after they went missing.
A botanist examined the nettles in the ditch and determined that they had been disturbed 13 and a half days earlier.
The leaves of the trees above were singed and the bodies had been partly burned.
A total of 64 different types of pollen, some of them from quite rare plants, were taken at the site. Several matched pollen found on Huntley's shoes, the pedals and foot-well of his car and a red petrol can.
Huntley knew the area well. He used to go plane-spotting there; his grandmother lived in Lakenheath and his father used to have a house half a mile from where the bodies were found.