UN Yemen envoy says Houthi assault on Marib 'must stop'
Houthi fighters ride on the back of a patrol truck as they secure the site of a pro-Houthi tribal gathering in a rural area near Sanaa, Yemen July 21, 2016/ Reuters
UN Yemen mediator Martin Griffiths on Thursday called for a stop to an offensive by the Houthi movement on the government-held city of Marib, warning that "the quest for territorial gain by force threatens all of the prospects of the peace process."
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