Multiple cars were ablaze at a parking garage in Kings Plaza Shopping Mall in Brooklyn.
It was unclear how many cars caught fire and if criminality was involved.
21 people were injured including 18 firefighters who were treated for minor injuries as the fire raged Monday at Kings Plaza Mall in Mill Basin.
The fire broke out on the second floor of the four-story garage at around at around 9 a.m. It says none of the injuries were considered life-threatening. Fire Commissioner Daniel Nigro said the responding firefighters suffered from heat exhaustion and smoke inhalation.
The fire quickly grew to a 6-alarm blaze and the Fire Department of NY said seven firefighters were treated for injuries as the fire raged.
"More than 50 FDNY units and more than 200 members continue to operate on scene".
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Video showed the blaze sending heavy smoke billowing onto Flatbush Ave. and the surrounding area.
The multi-floor parking garage stores about 120 vehicles for a nearby auto dealership, according to Nigro.
Fire officials checked the garage for any possible signs of structural damage.
Mall spokeswoman Dawn Simon told the New York Post that the mall had closed due to smoke from the fire.
People reported hearing explosions.
Eric Adams, borough president of Brooklyn, wrote on Twitter: "Please avoid the Kings Plaza area until further notice from emergency officials, if possible".