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Relatives of Egyptian Coptic Christians purportedly murdered by Islamic State (IS) group militants in Libya react after hearing the news on February 16, 2015 in the village of Al-Awar in Egypt's southern province of Minya. Egypt's leader vowed to punish the "murderers" responsible for the beheading of 21 Egyptian Christians after the Islamic State group in Libya released a video purportedly showing the mass killing. AFP PHOTO / MOHAMED EL-SHAHED (Photo credit should read MOHAMED EL-SHAHED/AFP/Getty Images)

Relatives of Egyptian Coptic Christians purportedly murdered by Islamic State (IS) group militants in Libya react after hearing the news on February 16, 2015 in the village of Al-Awar in Egypt's southern province of Minya. Egypt's leader vowed to punish the "murderers" responsible for the beheading of 21 Egyptian Christians after the Islamic State group in Libya released a video purportedly showing the mass killing. AFP PHOTO / MOHAMED EL-SHAHED        (Photo credit should read MOHAMED EL-SHAHED/AFP/Getty Images)