Monkeys being transported on a Mississippi highway escaped captivity Tuesday after the truck carrying them overturned, according to law enforcement.

All but one of the escaped monkeys were killed, the Jasper County Sheriff’s Department said in a post on Facebook, warning that the monkeys were “aggressive." It is not clear how many monkeys were originally in the truck or how many were killed.

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The truck was carrying Rehsus monkeys, which typically weigh around 16 pounds and are among the most medically studied animals on the planet. They were being housed at the Tulane University National Biomedical Research Center in New Orleans, Louisiana, which routinely provides primates to scientific research organizat

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