Panorama: Mission Impossible

The UN polices conflicts around the world, but is it fit to police itself? Documents leaked to the BBC reveal why the UN department tasked with rooting out corruption has been described as a 'combat zone' and not fit for purpose. From a maximum-security jail and the gold mines in Congo to the lap-dancing bars of New York, Raphael Rowe reveals how the organisation is struggling to eradicate the rot at its core.