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 crash happened approximately 100 miles from the state capital of Jackson. It's not clear what caused the truck to overturn. 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.

The Jasper County Sheriff's Department said the rhesus monkeys were from Tulane University, and initially wrote 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. The sheriff'

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