Deadly Kabul Blast

A huge bomb concealed in an ambulance has exploded in the Afghan capital, Kabul, killing at least 63 people and injuring more than 100.

Also in the programme: reports that Saudi billionaire Prince Alwaleed has been released; and are we on a collision course to nuclear war?

(Photo: Afghan security personnel arrive at a site after a bomb attack in Kabul. Credit: AFP/Getty Images)