The leak was reported at about 9 Saturday night at a two-story residential house at 2261 Walton Avenue in Fordham Heights.
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One man was rushed to the hospital in cardiac arrest - it is unclear if this was a result of the carbon monoxide.
Two EMTs are being evaluated for carbon monoxide exposure. They went into the building thinking it was a medical call, and were unaware of the other dangers.
Officials say a 'defective' boiler was the cause of the leak. The boiler was shut down, and the building has no heat.
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The building also reportedly had no carbon monoxide detectors.
Con Edison is on the scene to determine the exact source of the leak.
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