Explosion rocks New York's Chelsea neighborhood, 29 injured

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Firefighters gather as heavily armed police block the area while they search for an explosive device on West 27th street and 7th Avenue in Manhattan, New York. An explosion in a crowded Chelsea neighborhood in Manhattan on Saturday night left more than two dozen people injured, and authorities called the blast an "intentional act," but said there was no terrorist connection. New York Mayor Bill de Blasio also said a second site on 27th Street was being investigated. AP

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Police and firefighters work near the scene of an apparent explosion in Manhattan's Chelsea neighborhood, in New York. More than two dozen people sustained minor injuries in the explosion on West 23rd Street. AP

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Police arrive on the scene of an explosion in Manhattan's Chelsea neighborhood, in New York. AP

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Firefighters arrive at the scene of an apparent explosion in Manhattan's Chelsea neighborhood. AP

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Police work near the scene of an explosion in Manhattan's Chelsea neighborhood. An explosion in a crowded Manhattan neighborhood on Saturday night left more than two dozen people injured, and authorities said a second nearby site was also being investigated. AP

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Mayor Bill de Blasio, center, and NYPD Chief of Department James O'Neill, center right, speak during a press conference near the scene of an apparent explosion on West 23rd street in Manhattan's Chelsea neighborhood. AP