Lawyers acting for convicted murderess Amanda Knox claimed she was nowhere near the scene of Meredith Kercher's murder during an appeal hearing.

The 23-year-old, dubbed Foxy Knoxy, and her then boyfriend, Rafaelle Sollecito, were found guilty in December 2009 of killing of 21-year-old Meredith Kercher, from Coulsdon, in what prosecutors say was a sex game taken to the extreme.

The university student was sharing a house with the American student while on a year abroad in Perugia, Italy.

However lawyers for Knox claim evidence by a homeless man who alleges seeing Knox and Sollecito at the murder scene is unreliable.

During the trial Antonio Curatolo, said he saw the pair in a piazza near the flat she shared with Miss Kercher in Perugia. He told the court he was certain about what he saw because there were shuttle buses and other students around waiting to go out on the town.

Knox insists she spent the entire night at Sollecito's flat. Her lawyers produced shuttle bus operators who claimed there had been no buses running on the night and said Mr Curatolo's evidence was unreliable.

Prosecutor Manuela Comodi said there were other shuttle buses operating that night and not all the operators had been questioned.

Sollecito was jailed for 25 years for his part in the killing, while small-time drug dealer Rudy Guede was imprisoned for 30 years during an earlier hearing.

Knox's appeal hearing will continue on March 26.