A roadside bomb hit a United Nations vehicle in southern Afghanistan's main city on Tuesday, killing four Nepalese guards and an Afghan driver, police said. The victims were traveling in a U.N. convoy through Kandahar city, when the blast hit their gray sports utility vehicle, the Associated Press quoted Esmatullah Alizai, Kandahar's provincial police chief as saying. Four Nepalese men working as U.N. security guards as well as their Afghan driver were killed in the blast, Alizai said. -- SPA