Dr Joanne Liu, President of Médecins Sans Frontières

Stephen Sackur speaks with Joanne Liu, international president of Médecins Sans Frontières, Doctors without Borders. In early October, American forces in Afghanistan fired missiles into a Kunduz hospital killing 22, including 12 staff working for MSF. The organisation demanded that the incident be investigated as a war crime. But in the world's most dangerous conflict zones, is it possible to save lives and not take sides?