TUXTLA GUTIERREZ, Mexico – Mexican police Sunday discovered 210 mainly Central and South American migrants crammed inside a truck near the country’s southern border, an immigration official said.

The dehydrated and hungry migrants were found when the truck was searched at a highway checkpoint, the official said.

Police detained the truck’s driver and his assistant, both of whom will be transferred to a maximum-security prison, the official said.

The migrants were mainly from Brazil, Guatemala, El Salvador and Nicaragua, but also from India. They were packed so tightly into the truck that they had to remain standing, official said.

The official said the migrants had not eaten in 24 hours and were now being given food and water. They are being held at a Chiapas federal police station awaiting deportation.

Each year, hundreds of thousands of illegal migrants cross Mexico’s southern border on their way to the United States. They are often smuggled in brutal conditions, packed tightly inside tractor trailers on long journeys. They are subject to robbery, extortion and kidnapping along the way.