Consolidated Edison received a gas leak report fifteen minutes before the explosion and dispatched two crews. They arrived after the blast. The two destroyed buildings had housed fifteen residential apartments between them. The ground floor of 1644 Park Avenue held the Spanish Christian Church; 1646 had a piano store. When the National Transportation Safety Board investigated, they found natural gas saturating the soil around the site in varying concentrations - a signature of chronic leakage from infrastructure that had been failing long before the morning it finally gave way. The NTSB's Robert Sumwalt identified the gas main's age and revealed what residents and workers in the area had long suspected: the pipes beneath their streets belonged to another century.

The FDNY and NYPD reached the scene within two minutes. Fire companies stationed five blocks south reported hearing and feeling the explosion before receiving the dispatch call. Within a short time, the incident escalated to a five-alarm fire, bringing more than 250 firefighters to East Harlem. Morning television across the city's networks went dark on their regular programming, replaced by continuous coverage of the smoking rubble. On-the-fly interviews captured the scale of the shock: witnesses described the force of the blast rattling windows and shaking buildings across multiple blocks. The American Red Cross set up operations at nearby Public School 57, and MTA buses transported displaced residents who did not require medical attention to a Salvation Army shelter at 125th Street.

Eight people died in the explosion and the collapse that followed. Among them were Andreas Panagopoulos, a 43-year-old Greek musician; Rosaura Barrios Vazquez, 43, and her daughter Rosaura Hernandez Barrios, 22, a mother and daughter who perished together; and Mayumi Nakamura, a 34-year-old Japanese artist who had come to New York because she loved the city. Two of the recovered bodies were not immediately identified. These were people whose daily lives - practicing music, raising a family, making art - intersected fatally with the consequences of infrastructure neglect. They were not abstractions in a policy debate about aging gas mains; they were neighbors, artists, parents, and daughters whose absence left holes in communities stretching from East Harlem to Athens to Tokyo.

The blame fell in multiple directions. In June 2015, the NTSB pointed to failures by both Consolidated Edison and the city. Con Edison sued the city that same month, arguing that neglect of street infrastructure - specifically, depressions in the pavement that the city had been notified about on multiple occasions - had contributed to the disaster. By November 2015, the New York Public Service Commission had accused Con Edison of 11 violations of gas-safety regulations: the utility had incorrectly installed a gas pipe and failed to notify the fire department after two separate reports of gas odors. A neglected city sewer line that had undermined the gas main was identified as a contributing factor. In February 2017, Con Edison agreed to pay $153 million to settle the charges - described by Governor Andrew Cuomo as the largest payment for a gas safety incident in New York State history. The money was directed toward gas safety education, pipe repairs, and compensation for affected residents and businesses. Con Edison did not admit wrongdoing.