An electrical fire and gas leak led to a blast that shattered the windows of an Upper West Side gym Sunday night, FDNY officials said.
Firefighters had already cleared out the Equinox gym building on Broadway near W. 92nd St. when an explosion blew out the windows on the first floor at about 6:20 p.m., an FDNY spokesman said.
Firefighters first showed up at about 3:45 p.m., after getting a report of an electrical fire in the basement.
First responders found elevated carbon monoxide levels, and evacuated five businesses in four nearby buildings, the spokesman said.
Firefighters had already started setting up a safety zone when the gas explosion happened.