Police discovered some 210 migrants from Brazil, India and Central America hidden in a truck that was traveling on a highway in Chiapas, south Mexico.
The driver and his companion, both Mexican citizens, were arrested after the vehicle was stopped at a checkpoint close to Veracruz. The migrants were crowded and dehydrated, according to reports.
One individual told the Associated Press that he had paid $3,000 to smugglers to take him from Guatemala to the U.S.
In May, 513 undocumented migrants were discovered at a checkpoint elsewhere in the state.
As InSight has reported, an increasing number of migrants from Asia and Africa try to enter the U.S. via Mexico.