SANAA (Reuters) - A U.S. military instructor was shot and seriously wounded in an attack by unidentified assailants in the Red Sea city of Hudaida on Sunday, a Yemeni security source said.

The source said two other U.S. instructors travelling in the same car were not hurt in the attack.

The U.S. instructors were training Yemeni coastguards.

(Reporting by Mohammed Ghobari; Writing by Sami Aboudi; Editing by Louise Ireland)