Authorities said the fire started around 5:30 a.m. inside a three-story vacant building at 1794 Broadway in Bushwick.
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The fire was elevated to a second alarm shortly after.
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Citizen App video captured smoke coming from the building.
One firefighter was treated on the scene but refused to go to the hospital.
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Operations on the fire remain ongoing.
This is breaking news. This story will be updated as more information becomes available.
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