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Firefighters arrive at the scene of an apparent explosion in Manhattan's Chelsea neighborhood, in New York, Saturday, Sept. 17, 2016. A law enforcement official tells The Associated Press that an explosion in the Chelsea neighborhood appears to have come from a construction toolbox in front of a building. The official spoke on condition of anonymity because the person wasn't authorized to speak about an ongoing investigation. Police say 26 people have sustained minor injuries in the explosion on West 23rd Street. (AP Photo/Andres Kudacki)
Firefighters arrive at the scene of an apparent explosion in Manhattan's Chelsea neighborhood, in New York, Saturday, Sept. 17, 2016. A law enforcement official tells The Associated Press that an explosion in the Chelsea neighborhood appears to have come from a construction toolbox in front of a building. The official spoke on condition of anonymity because the person wasn't authorized to speak about an ongoing investigation. Police say 26 people have sustained minor injuries in the explosion on West 23rd Street. (AP Photo/Andres Kudacki)

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    Explosion rocks New York's Chelsea neighborhood

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Explosion rocks New York's Chelsea neighborhood

Surveillance video captured an explosion at the intersection of W. 23rd Street and 6th Avenue around 8:30 p.m on Saturday. Police are investigating.

Explosion rocks New York's Chelsea neighborhood

Surveillance video captured an explosion at the intersection of W. 23rd Street and 6th Avenue around 8:30 p.m on Saturday. Police are investigating.