At least nine people were injured in a gas explosion at a detached home in the Bronx in New York City, officials said Tuesday.

The most seriously injured is an 82-year-old woman who is in the hospital in critical condition due to smoke inhalation, officials said.

The explosion happened about 11 a.m. at a three-story residential building with one residential unit.

The injured include four residents and five police officers.

More than 100 firefighters and EMS have descended on the scene.

This is a developing story. Please check back for updates.