Egyptian Coptics attend a mass led by Egypt's Coptic Pope Tawadros II to honor the memory of the Egyptian Coptic Christians murdered by Islamic State (IS) group militants in Libya, at Saint-Mark's Coptic Cathedral in Cairo's al-Abbassiya district on February 17, 2015. Egypt called for a UN-backed international intervention in Libya after launching air strikes on Islamic State group targets in the country following the jihadists' beheadings of the Egyptian Coptic Christians on a Libyan beach. Photo by Amr Sayed