Horrific and incredibly troubling. That's how the discovery of mass graves near two hospitals in Gaza has been described by the UN High Commissioner and the US State Department. Palestinian authorities say hundreds of bodies - some covered in waste, some with hands tied, and some stripped of clothes - have been found.The UN's High Commisioner Volker Turk wants an independent investigation - Israel's military says claims it created the mass graves are baseless.  Guest:Professor Ghassan Abu-Sittah, plastic and reconstructive surgeon who worked in Gaza at the Al Shifa hospital following the October 7 attack, now rector at Glasgow University