Carol and Graham Fisher were shot dead after a struggle

A woman aged 30 and man aged 27, from the St Dennis area, have been bailed pending further inquiries.

Mr and Mrs Fisher were shot and beaten at their bungalow near their A39 garage on 5 November last year.

A �10,000 reward has been offered to find the couple's killers and a number of arrests have been made.

Senior Investigating Officer, Detective Superintendent Stuart Newberry, said: "This is very much an active investigation.

"I am concerned that there are some people who have not yet come forward with information."