Head of UN investigators calls for an IS "Nuremberg" British lawyer Karim Khan, who has spent the past year travelling around Iraq with a team of almost 80 people to gather evidence and witness testimony on Islamic State group crimes for the UN body known as UNITAD, gives an interview in Baghdad. The head of the UN special probe into Islamic State group crimes has called for trials like those at Nuremberg of Nazi leaders to ensure IS victims are heard and its ideology "debunked". IMAGES AND SOUNDBITES