A big explosion rocked the Afghan capital late Wednesday night but there is no report about casualties. Afghan police officials, on condition of anonymity, said it was a rocket fired from the nearby mountains and the target was the US embassy. The rocket missed the target and hit a nearby building of the Afghanistan Radio and TV.Another official said one employee, believed to be a security guard, was injured in the attack. The building was partially damaged and smoke can be seen rising out of the area. The targeted building is close to US embassy and the NATO headquarters in Kabul. The NATO forces immediately rushed to the building and cordoned the area. No one was allowed to go close to the site of the blast.