Chilling surveillance footage captured the “Wild West” moment an NYPD cop shot a gun-toting maniac who allegedly fired at officers after threatening to shoot up Mount Sinai Hospital.

The tense clip showed the gunman – 20-year-old Elijah Brown – holding his weapon in his hand as he casually walked on Madison Avenue between East 95th and 96th streets late Thursday after telling a bodega worker he planned to riddle the hospital with bullets.

As cops approached Brown, he suddenly whipped around and fired at the officers – prompting at least one to return fire from the street, the footage shows.

Brown then collapsed backward on the sidewalk, where two cops ran to tend to him, soon joined by several others.

The gunman was transported to the hospital in an NYPD vehicle. He was later pronounce

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