MEXICO CITY (Reuters) - Mexican authorities discovered 112 migrants, including four babies, huddled alive in the back of a truck as it traveled along a highway in the country’s south, the attorney general’s office said on Sunday.

The truck, which officials said had ventilation and water for the passengers, was intercepted on a highway that connects the southern states of Chiapas and neighboring Tabasco and the driver was arrested.

Every year, thousands of migrants, mostly Central Americans, escaping from poverty and violence, make their way north through Mexico in hopes of reaching the United States.

The attorney general’s office said in a statement that 23 minors were among the immigrants from Guatemala, El Salvador, Honduras and Ecuador, found in the back of the truck.

The migrants were awaiting medical checkups.