A post mortem has been carried out on two men whose bodies were found at Thorney Dyke in Peterborough on Wednesday.
John Chapman, 56, and Lukasz Slaboszewski, 31, both from the Peterborough area, died from stab wounds.
Their deaths are being treated as murder and are being linked to the murder of Kevin Lee whose body was discovered in Newborough on Saturday (March 30).
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.