The assailants rode a motorbike in their attack on the man, who was the deputy directer of a Swedish language centre in the city, 270 kilometres (173 miles) southwest of Sanaa, the official said on condition of anonymity, adding they fled the scene after the shooting. The victim was shot dead in his car in the neighbourhood of Sena, he added. The US embassy in Sanaa said it did not have information about the killing and was investigating. The attack comes two days after an official said suspected Al-Qaeda gunmen abducted a Swiss woman, also a teacher at a language school, in the Red Sea port of Hodeida and moved her to the restive Shabwa province further east.