Authorities say more than 60 were injured in the crash, northwest of Mexico City, as the cause remains unclear.
At least 10 people have been killed after a freight train hit a double-decker bus in Mexico, according to authorities.
The crash occurred in an industrial zone on the highway between Atlacomulco, a town about 115km (71 miles) northwest of Mexico City, and Maravatio in the Michoacan state on Monday.
Images from the crash showed portions of the top deck of the bus smashed in and its metal frame badly dented. First responders were on the scene and cordoned off the area.
Authorities said at least 61 others were injured in the incident.
