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A 20-story chimney running along the side of a NYCHA building in The Bronx collapsed Wednesday morning, and the FDNY is investigating whether an explosion in the boiler room on the first day of heat season triggered the collapse.

The partial collapse at the Mitchel Houses in Mott Haven ripped open the corner of 205 Alexander Ave., but did not appear to have affected adjacent apartments and miraculously resulted in no injuries.

Tenants in the F and G lines on both sides of the chimney were evacuated while the Department of Buildings looked at whether the

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