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Foreign security guards stand near the main gate of Cure International Hospital in Kabul, Afghanistan, Thursday, April 24, 2014. The U.S. embassy in Afghanistan says three American doctors have been killed at by an Afghan security guard who opened fire at a hospital in Kabul. The shooting at Cure International Hospital in western Kabul was the latest attack on foreign civilians in the Afghan capital this year. (AP Photo/Massoud Hossaini)

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