Monkeys that were being transported Tuesday on a Mississippi highway escaped after the truck carrying them overturned, and all but one have since been killed, authorities said.

The Jasper County Sheriff's Department said the rhesus monkeys were from Tulane University, writing in a post on Facebook that "they are aggressive to humans and they require PPE to handle." It's not clear how many monkeys were originally in the truck or how many were killed.

Video showed monkeys crawling through the tall grass on the side of Interstate 59 just north of Heidelberg, Mississippi, with wooden crates labeled "live animals" crumpled and strewn about.

Rhesus monkeys, which typically weigh around 16 pounds, are among the most medically studied animals on the planet. The escaped monkeys carry diseases

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