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Investigators are looking into whether a safety system failure in the boiler of a Bronx public housing building allowed gas to build up inside the boiler chamber and travel up a 20-story chimney, a breakdown that triggered a massive explosion when a technician flipped the switch to turn it on, THE CITY has learned.

In addition, THE CITY has also learned that there was another explosion in that same boiler room at the Mitchel Houses in Mott Haven about four years ago. In that incident, the gas built up in the chamber but did not escape into the chimney, s

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