A teen was fatally shot and three other people struck by gunfire – including a woman delivering slushies – when a Bronx car meet-up devolved into chaos over the weekend, authorities and sources said.

Werling Mendez, 18, was killed by a bullet to the head during the violence-wracked gathering – which was part of a social-media-fueled street-showdown trend – around 5:40 a.m. Sunday on East 233rd Street near Boston Road in Eastchester, cops said.

More than 60 shell casings were recovered at the scene, according to the sources.

Mendez, who lived about 3 miles away in Olinville, was rushed to BronxCare Health System, where he succumbed to his…

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