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Armed police officers guard near the London landmark Big Ben in London, Thursday, Dec. 31, 2015. Security is going to high in the capital this New Year's Eve following the Paris attacks and with Belgium authorities cancelling the New Year's Eve fireworks in Brussels after a terrorism threat. (AP Photo/Frank Augstein)
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An armed police officer stands next to Guards at Buckingham Palace before New Year's Eve celebrations in London, Britain December 31, 2015. About 3,000 police will be on duty across central London for the celebrations, with an increased number of firearms officers in and around major stations. REUTERS/Peter Nicholls
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Armed police officers guard behind a fence near the London landmark Big Ben in London, Thursday, Dec. 31, 2015. (AP Photo/Frank Augstein)
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Belgian soldiers patrol in central Brussels, December 31, 2015. Belgian police have detained six people during house searches in Brussels in an investigation into a plot to carry out an attack in the city on New Year's Eve, prosecutors said on Thursday. REUTERS/Francois Lenoir
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A soldier patrols at the Notre Dame cathedral in Paris, Wednesday, Dec. 30, 2015. France's defense minister has visited troops on duty ahead of unusually tense New Year's Eve celebrations in Paris after November attacks that left 130 dead and hundreds injured. (AP Photo/Michel Euler)
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The French Foreign Legion patrol at Auber's metro station in Paris, Wednesday, Dec. 30, 2015. (AP Photo/Michel Euler)
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Police officers prepare to be deployed to secure New Year celebrations in Bali, Indonesia, Thursday, Dec. 31, 2015. Indonesia is on high alert after authorities said last week that they had foiled a plot by Islamic militants to attack government officials, foreigners and others in the world's most populous Muslim nation. (AP Photo/Firdia Lisnawati)
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Chinese paramilitary police personnel stand on duty on the Bund, a popular tourist attraction in Shanghai, China, Thursday Dec. 31, 2015. Authorities canceled the annual countdown at the Bund as a precaution against a repeat of last year's deadly stampede. (Chinatopix Via AP)
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A Kurdish demonstrator argues with members of Turkish police special forces during a protest against the curfew in Sur district and security operations in the region, in the southeastern city of Diyarbakir, Turkey December 31, 2015. REUTERS/Sertac Kayar