The accident occurred on Saturday on a highway between Garzón and Neiva in the southwestern part of the country.
According to a police report obtained by the AP, the bus driver may have dozed off at the wheel, which may have caused the fatal accident.
Authorities are still working to determine the circumstances surrounding the bus overturning. They suspect the driver may have suffered a so-called “microsleep” - a condition in which a person falls asleep for a few seconds.
Footage shared on social media shows people crying next to the bus, which overturned on its way to the capital, Bogotá.
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