A massive fire ripped through a Hudson Valley business where HBO is filming. Ulster County Fire/Rescue Incidents reports a second-alarm structure fire at the 613 Automotive Group in Ellenville located on South Main Street began around 1 a.m. on Thursday.

The auto dealership is being used as a set by HBO. The Village of Ellenville Police Department previously announced roads near the dealership would be closed Wednesday and Thursday for filming.

Odom.TV shared video of the massive blaze on their Facebook.

As of this writing, the fire is ongoing and causing traffic delays in Ulster County.

The auto dealership is being used for an HBO miniseries starring Mark Ruffalo and Melissa Leo. ABC reports it's believed some antique cars were at the dealership at the time of the fire.

Ruffalo, who lives in the Hudson Valley, is playing twin brothers and serving as executive producer in the limited series based on the best selling novel by Wally Lamb. Oscar winner Melissa Leo and Rosie O'Donnell, Archie Panjabi, Imogen Poots and Juliette Lewis also star in the miniseries.

It's unclear what caused the fire. As of this writing, no injuries have been reported.

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