Mexican police and immigration agents detained hundreds of Central American migrants Monday in the largest single raid on a migrant caravan since the groups started moving through the country last year.

Police targeted isolated groups at the tail end of a caravan of about 3,000 migrants who were making their way through the southern state of Chiapas with hopes of reaching the U.S. border.

As migrants gathered under spots of shade in the burning heat outside the city of Pijijiapan, federal police and agents passed by in patrol trucks and vans and forcibly wrestled women, men and children into the vehicles.

A Central American migrant pushing a child in a baby carriage is detained by a Mexican immigration agent on the highway to Pijijiapan, Mexico, Monday, April 22, 2019. (AP Photo/Moises Castillo)
A Central American migrant pushing a child in a baby carriage is detained by a Mexican immigration agent on the highway to Pijijiapan, Mexico, Monday, April 22, 2019. (AP Photo/Moises Castillo)

The migrants were driven to buses, presumably for subsequent transportation to an immigration station for deportation processing. As many as 500 migrants might have been picked up in the raid, according to Associated Press journalists at the scene.

Some of the women and children wailed and screamed during the detentions on the roadside.

Mexico welcomed the first caravans last year, but the reception has gotten colder since tens of thousands of migrants overwhelmed U.S. border crossings, causing delays at the border and anger among Mexican residents.

A Central American migrant child cries as she is asked to get into an immigration vehicle as she is detained on the highway to Pijijiapan, Mexico, Monday, April 22, 2019. (AP Photo/Moises Castillo)
A Central American migrant child cries as she is asked to get into an immigration vehicle as she is detained on the highway to Pijijiapan, Mexico, Monday, April 22, 2019. (AP Photo/Moises Castillo)

Last Friday, local media reported a series of detentions of migrants in nearby Mapastepec, where thousands were awaiting normalization of their migratory status.

Mexico’s National Migration Institute did not immediately respond to requests for comment. The National Human Rights Commission said it had interviewed more than 200 people detained in Mapastepec.

The detentions came as the U.S. has ramped up public pressure on Mexico to do more to stop the flow of migrants. President Donald Trump railed against the government of his Mexican counterpart, Andrés Manuel López Obrador, and threatened to shut the entire border down, but then quickly congratulated Mexico for migrant arrests just a few weeks ago.

A Central American migrant is detained by Mexican immigration agents on the highway to Pijijiapan, Mexico, Monday, April 22, 2019. (AP Photo/Moises Castillo)
A Central American migrant is detained by Mexican immigration agents on the highway to Pijijiapan, Mexico, Monday, April 22, 2019. (AP Photo/Moises Castillo)

Mexico already allows the United States to return some asylum seekers to Mexico as their cases play out. And government officials said in March they would try to contain migrants heading north at the Isthmus of Tehuantepec, the narrowest part of the country’s south and easiest to control. Pijijiapan and Mapastepec are on the isthmus.

In its most recent statement from last week, the Migration Institute said 5,336 migrants were in shelters or immigration centers in Chiapas, and over 1,500 of them were “awaiting deportation.”

The Rights Commission said Sunday that more than 7,500 migrants were in detention, at shelters or on the road in the southern state. It urged authorities to carry out a proper census of the migrants and attend to their needs, particularly children.

A Central American migrant detained by Mexican immigration agents looks out from a van on the highway to Pijijiapan, Mexico, Monday, April 22, 2019. (AP Photo/Moises Castillo)
A Central American migrant detained by Mexican immigration agents looks out from a van on the highway to Pijijiapan, Mexico, Monday, April 22, 2019. (AP Photo/Moises Castillo)

Most of the migrants who have arrived in groups to southern Mexico in recent weeks originated in Honduras. There they joined previous groups of migrants from other Central American countries along with some Cubans and Africans.

Central American migrants traveling in a caravan to the U.S. border walk on a road in Pijijiapan, Mexico, Monday, April 22, 2019. (AP Photo/Moises Castillo)
Central American migrants traveling in a caravan to the U.S. border walk on a road in Pijijiapan, Mexico, Monday, April 22, 2019. (AP Photo/Moises Castillo)
Central American migrants traveling in a caravan to the U.S. border walk on the highway to Pijijiapan, Mexico, Monday, April 22, 2019. (AP Photo/Moises Castillo)
Central American migrants traveling in a caravan to the U.S. border walk on the highway to Pijijiapan, Mexico, Monday, April 22, 2019. (AP Photo/Moises Castillo)
Central American migrants traveling in a caravan to the U.S. border walk hand in hand on the shoulder of a road in Pijijiapan, Mexico, Monday, April 22, 2019. (AP Photo/Moises Castillo)
Central American migrants traveling in a caravan to the U.S. border walk hand in hand on the shoulder of a road in Pijijiapan, Mexico, Monday, April 22, 2019. (AP Photo/Moises Castillo)
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