The Manhattan district attorney, Robert M. Morgenthau, announced manslaughter charges on Monday against three construction supervisors and a subcontractor, saying their gross negligence in dismantling the former Deutsche Bank building played a critical role in the deaths of two firefighters who responded to a smoky blaze there in 2007.

The building’s sprinkler system had been dismantled and fire exits were sealed off as part of the demolition and asbestos abatement. It was later learned that a standpipe, designed to carry water to the building’s upper floors during a fire, had also been dismantled and that cheap, non-fire-retardant plywood had been used in the deconstruction.

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