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Surface-to-air missiles are seen over Syria's capital Damascus on April 14, 2018, as the Syrian air defenses are responding to U.S. attacks. (Xinhua/Ammar Safarjalani)

Surface-to-air missiles are seen over Syria's capital Damascus on April 14, 2018, as the Syrian air defenses are responding to U.S. attacks. (Xinhua/Ammar Safarjalani)