A man donates blood in National Blood Transfusion and Research Centre in Sanaa, Yemen, Wednesday, Aug. 9, 2017. The director of Yemen's national blood bank says the facility could shut down within a week after a medical aid charity ended its support. Ayman el-Shihari, the blood bank's general director, said Thursday its closure could lead to a "humanitarian catastrophe." (AP Photo/Hani Mohammed)
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