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.

HEIDELBERG, Miss. -- 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.

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

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