Images of the fire were posted to social media on Monday night.
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The Cornwall Office of Emergency Management said winds were spreading the flames around 7:30 p.m.
Breakneck Mountain is a popular area for hiking and getaways from the city.
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The fires have jumped Route 9D, closing the road between Cold Spring and Dutchess Junction.
The cause of the fire is not yet known.
Few other details were released.
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