The accident occurred in the early morning hours when the bus carrying the victims collided with the back of a tractor-trailer carrying corn, which had come loose.

Zacatecas governor David Monreal earlier yesterday had initially reported a preliminary death toll of 24 people, but the state attorney-general’s office later revised the tally in a statement.

The attorney-general’s office said it was “carrying out investigations to arrest the driver” of the tractor-trailer.

Efforts were ongoing yesterday morning to recover some of the bodies that had fallen into a ravine, a local government official who asked not to be named told Reuters.

Images shared on social media showed rescue teams and security forces, including military personnel, securing the area while rescuers worked to recover the bodies.

The bus was headed for Ciudad Juarez, a city on the US-Mexico border in the state of Chihuahua.

The victims did not include migrants, according to the attorney-general’s office.