FDNY fire marshals are investigating the cause of a three-alarm fire that devastated the H Mart at 29-02 Union St. in Flushing on Tuesday morning.

The FDNY received a call just before 3:40 a.m. on Sept. 23 of a reported fire at the Korean market, and arriving units were met by heavy smoke and fire conditions. A second alarm was transmitted at 3:54 a.m. and a third alarm for relief purposes bringing a total of 33 units and 138 firefighters and EMS personnel to the scene between 29th Avenue and 29th Road, according to FDNY.

One firefighter sustained minor injuries and was transported to New York-Presbyterian Queens Hospital. The fire was brought under control at 5:01 a.m., the FDNY said.

Inspectors from the city’s Department of Buildings issued a full vacate order at 29-02 Union Street on

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