Yemeni gunmen shot dead a German national working as security officer at the German embassy in Yemen\'s capital of Sanaa on Sunday, a police official told Xinhua. \"Three gunmen on a car opened fire at a German national, who worked as a security officer at the German embassy in Sanaa, as he went out of a supermarket in the southern suburb of Sanaa,\" the official said. Witnesses told Xinhua that the gunmen fled the scene after the incident.