**A court in Italy has been shown a knife prosecutors say could have been used to kill British student Meredith Kercher.**The knife - wrapped in plastic - was shown to the eight-member jury in the murder trial of Amanda Knox and her former boyfriend Raffaele Sollecito.
The pair watched as it was brought into the courtroom in a white box as part of the testimony of a forensic expert.
Ms Knox and Mr Sollecito deny killing the 21-year-old exchange student from London in Perugia in 2007.
On Friday, forensic expert Francesco Vinci told the court that key forensic evidence had been wrongly linked to one of the defendants.
A bloody footprint at the crime scene had been attributed to Mr Sollecito, but defence witness Mr Vinci said the print was the wrong size.
He compared pictures of a footprint on a bathroom rug at the house where Ms Kercher was found with images of Mr Sollecito’s feet and told the court they “absolutely don’t match”.
Ms Kercher, who was studying at Leeds University, was found with her throat cut in a house which she and Ms Knox shared.
Prosecutors say she was killed during what had begun as a sex game.
A third person, Rudy Guede, has been jailed for 30 years for the killing. He has denied wrongdoing and is appealing against his conviction.
The trial continues.