Nine Saudi soldiers have been captured by Houthi rebels in northern Yemen during fighting. A rebel spokesman based in Germany said the incident took place inside Yemeni territory and urged Saudi Arabia to stay out of the conflict. He stressed that the rebels' grievance was with the Yemeni government and not with Saudi Arabia. The Saudi defence ministry confirmed nine soldiers were missing and said they may have been taken prisoner. The rebels, known as Houthis, accuse Saudi Arabia of supporting the Yemeni government in offensives against them.