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Associated Press
A police officer looks at flower tributes placed at a temporary memorial site close to the Lindt Chocolat Cafe in the central business district of Sydney, Australia, Wednesday, Dec. 17, 2014. Three people including the gunman were shot after police ended the siege in the coffee shop early Tuesday. Australia's prime minister acknowledged Wednesday that the nation's security system failed to keep track of a gunman responsible for the deadly siege, and promised a transparent investigation into why the man was not on any terror watch list despite having a long criminal history. (AP Photo/Rob Griffith)

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