Remains found in the river where the body of Suzanne Blamires was discovered do not belong to two other murdered prostitutes, police have said.
Forensic tests on the matter found in the River Aire at Shipley, West Yorkshire, revealed they were animal and not human.
Meanwhile, tests continued on tools discovered in a suitcase pulled out of the river over the weekend.
A West Yorkshire Police spokesman said: "Further forensic examinations on remains recovered this weekend show they are not human but animal waste which appears to be from food preparation."
Stephen Griffiths, 40, who referred to himself in court as the "crossbow cannibal", has been charged with murdering Ms Blamires.
He is also accused of killing Shelley Armitage and Susan Rushworth whose bodies have never been found.
