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Stephen O'Brien - the UN's Humanitarian Affairs and Emergency Relief Coordinator - says his convoy was apparently shot at and had to turn back while trying to enter the besieged Yemeni city Taez. Mr O'Brien, who's in the country to assess what he calls Yemen's "imminent famine", tells us that Shiite Houthi rebels were the most likely culprits. (Photo credit: AFP/Getty Images)
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