A section of a 20-storey residential building partially collapsed in New York City on Wednesday morning, and authorities say there are no injuries. Firefighters and emergency responders searched into the afternoon for anyone who may have been trapped under the mounds of rubble outside the building, which is part of a public housing development in the Bronx. Witnesses reported hearing a loud boom followed by the collapse. The city's fire commissioner indicated that the incident seems to have stemmed from an explosion in the ventilation shaft of a boiler room, leading to an investigation for potential gas leaks. Residents were evacuated as a precautionary measure, although most were later allowed to return while gas services were suspended. The New York City Housing Authority is reviewing the incident, which comes after previous violations related to plumbing and safety concerns were reported. Fortunately, no lives were lost in this incident, marking a rare stroke of luck amidst continuing safety investigations.