Afghanistan: Kabul blast 'an accident' at arms depot --- A powerful explosion in the Afghan capital, Kabul, was an accident at an arms depot, Afghan officials say. -- Kabul's police chief said a rocket had detonated by accident inside the Afghan National Directorate of Security and there were no casualties. -- The International Security Assistance Force (Isaf) confirmed a blast took place around 10:20 (05:50 GMT) close to Nato headquarters in the city. - More, BBC