SANAA (Reuters) - Gunmen opened fire on the motorcade of Yemen's prime minister on Saturday, but Salem Basindwa escaped unhurt, an aide said. Ali al-Sarari, an adviser to Basindwa, said the attack happened in the evening in Sanaa while Basindwa was returning home from his office. Sarari said Basindwa's guards identified the license plates of the car used in the attack and security forces were trying to track it down after the assailants fled the scene. U.S. ...