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U.S. President Barack Obama pauses before a wreath before remembrance ceremonies for 9/11 victims at the Pentagon 9/11 Memorial in Washington September 11, 2013.GARY CAMERON/Reuters

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Riot police fire tear gas at protesters during clashes in central Hatay, September 11, 2013. Turkish police used teargas to disperse crowds who were rallying against the death of Ahmet Atakan, 22, who died in the early hours of Tuesday at a demonstration against Prime Minister Tayyip Erdogan's handling of nationwide protests this summer.UMIT BEKTAS/Reuters

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A laundryman dries clothes in middle of railway tracks at a suburban station in Mumbai September 11, 2013.DANISH SIDDIQUI/Reuters

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Jim Lynch-Staunton (L) and his father Hugh ride at the historic Waldron ranch where a cooperative of ranchers have entered an agreement with the Nature Conservatory of Canada to permanently conserve over 30,000 acres of land on the Eastern Slopes of the Rocky Mountains in southern Alberta, September 11, 2013.Todd Korol/The Globe and Mail

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Protesters grab the shield of a police officer on the ground during a protest against President Enrique Pena Nieto's education reform in Mexico City September 11, 2013. Pena Nieto signed into law on Tuesday a government bill to overhaul an education system that badly lags global peers, despite teacher protests seeking to derail it.STRINGER/MEXICO/Reuters

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A Free Syrian Army fighter takes a position as he aims his weapon near Hanano Barracks, which is controlled by forces loyal to Syria's President Bashar al-Assad, in Aleppo September 11, 2013.MUZAFFAR SALMAN/Reuters

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A member of the European Parliament attends a debate on the state of union, in Strasbourg, September 11, 2013.VINCENT KESSLER/Reuters

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Indian actress Parineeti Chopra hugs fans as she arrives for a screening of her film "A Random Desi Romance" at the 38th Toronto International Film Festival in Toronto September 11, 2013.MARK BLINCH/Reuters

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Carrie Bergonia of Pennsylvania looks over the name of her fiancÈ, firefighter Joseph Ogren, at the 9/11 Memorial during ceremonies marking the 12th anniversary of the 9/11 attacks on the World Trade Center in New York, Wednesday, Sept 11, 2013.Chris Pedota/The Associated Press

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