islamic state
  • Ruins in Aleppo, Syria (ZEIN AL-RIFAI/AFP/Getty Images)

    American aid worker Kayla Mueller was working with Doctors without Borders in Aleppo, Syria when she was kidnapped in 2013. Her family and U.S. officials confirmed her death Tuesday.

    LAST UPDATE : Feb 11, 2015, 5:13 AM EST
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