At least ten families were evacuated.
Firefighters and ConEd workers found potentially fatal levels of carbon monoxide in their homes. They said the levels were ten to one hundred times beyond the same level.
Because everyone was evacuated so quickly, no one suffered from carbon monoxide poisoning.
Officials said manhole fires are common when snow and salt are melting onto underground cables. The melt eats away at the protective coating on the cables, sparking fires.
People on the block were allowed back into their homes once fire officials determined that the CO levels had gone down.
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