A single police car is guarding the entrance to the lonely fen dyke near Thorney where two bodies were found on Wednesday.
Police are treating the deaths as unexplained but have as yet released few other details. It's believed they will be investigating whether there is a link to the killing of 48-year-old Kevin Lee.
Mr Lee was was found in a ditch near Newborough just a few miles from Thorney on Saturday. He had been stabbed to death.
Five people have been arrested in connection with his death and one has appeared in court charged with perverting the course of justice.
Two people are being questioned in relation to the deaths of three men near Peterborough.
Police have searched a house in Cambridgeshire which is at the centre of a triple murder enquiry.
Cambridgeshire police are investigating the murders of three men in the Peterborough area.