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People walk on a street decorated with a Turkish flag near the Besiktas football club stadium Vodafone Arena in Istanbul, Sunday, Dec. 11, 2016 following the late Saturday explosion. Turkey declared a national day of mourning Sunday after twin blasts in Istanbul killed dozens of people and wounded many others near a soccer stadium — the latest large-scale assault to traumatize a nation confronting an array of security threats. (AP Photo/Emrah Gurel)