Video: Knox to face re-trial in Kercher case

There has been a dramatic development in the search for the killers of the former Leeds University student Meredith Kercher.

Amanda Knox and her ex boyfriend Raffaele Sollecito, who were set free after being cleared by appeal court judges of being the murderers, are to go on trial again. Meredith's family have welcomed the decision and say they have a long journey ahead. Mark Witty reports.