An 11-year-old boy was killed and four members of his family were critically injured in the early hours of Wednesday, October 28, when a fire driven by an electric bike's lithium-ion battery tore through their apartment on the 11th floor of the Patterson Houses, a New York City Housing Authority (NYCHA) development in the Mott Haven section of the Bronx, city officials said. The fire broke out just before 1 a.m., and Fire Department of New York (FDNY) crews arrived within four minutes, according to the department.

Officials said the battery caught fire in the kitchen, where the e-bike itself was standing in the apartment's path of exit. FDNY Chief of Department John Esposito said the fire and the bike were in the path of egress, so the people inside were not able to get out, and described firefighters crawling past the uncontrolled fire to search the rest of the apartment. One victim was found behind the door and quickly removed, he said.

The boy died of his injuries. The four survivors — two teenagers and two adults from the same family — were critically hurt with burns and smoke inhalation and were intubated, officials said. Neighbours described watching emergency crews work on the children outside the building for an extended period before they were taken to hospital.

What city leaders said at the scene

Mayor Zohran Mamdani, who went to the scene and later spoke alongside fire officials, called it an immensely challenging, fast-evolving situation and said he was heartbroken to report that an 11-year-old child had lost his life. He said no other units in the building had to be evacuated. Mamdani noted that e-bikes are tools many residents need for work, but said the danger shown by this fire is why the safety guidelines issued by his office and the FDNY must be followed.

FDNY Commissioner Lillian Bonsignore said lithium-ion batteries have now sparked 401 fires in New York City this year, injuring 74 people and killing six. Last year, officials reported 292 such fires, 51 injuries and one death — a comparison that shows how quickly the toll is rising.

The housing authority's rule, and the question it now faces

NYCHA Chief Executive Officer Lisa Bova-Hiatt said the housing authority's rules allow one e-bike to be charged inside an apartment, provided it is kept away from exits and an adult is present and awake while it charges. At the press conference, the mayor was asked directly whether those rules should now change; no rule change was announced on Wednesday.

New York Attorney General Letitia James issued a consumer safety alert the same day. "I am praying for the family and loved ones of the 11-year-old child lost in this morning's fire, and I hope for a speedy recovery for the others injured," James said. "Far too many lives have been tragically cut short or forever changed by these batteries. I understand that e-bikes and e-scooters can be necessary tools, so I encourage all New Yorkers to handle these vehicles and their batteries carefully." Her office is distributing an e-bike safety flyer in English, Spanish, Simplified Chinese, Bengali and Haitian Creole.

Why this matters beyond one building

E-bikes and e-scooters are essential work equipment for thousands of delivery riders in New York, including many Punjabi and other South Asian immigrant workers, and they are stored and charged in exactly the kind of apartments where a battery fire leaves the least room to escape. Fire officials say a failing lithium-ion battery can ignite quickly and spread rapidly, which is why the position of the device — in this case, blocking the only way out — can decide whether a family survives.

What happens next: FDNY fire marshals are investigating the fire, the four survivors remain in hospital in critical condition, and city officials say the battery-safety guidance will keep being pushed across public housing and delivery-rider communities. No charges or official finding about the specific battery in this fire had been announced as of Thursday morning.