Central American migrants walking to the U.S. start their day departing Ciudad Hidalgo, Mexico, Sunday, Oct. 21, 2018. Despite Mexican efforts to stop them at the border, about 5,000 Central American migrants resumed their advance toward the U.S. border early Sunday in southern Mexico. Their numbers swelled overnight and at first light they set out walking toward the Mexican town of Tapachula. (AP Photo/Moises Castillo)

Central American migrants walking to the U.S. start their day departing Ciudad Hidalgo, Mexico, Sunday, Oct. 21, 2018. Despite Mexican efforts to stop them at the border, about 5,000 Central American migrants resumed their advance toward the U.S. border early Sunday in southern Mexico. Their numbers swelled overnight and at first light they set out walking toward the Mexican town of Tapachula. (AP Photo/Moises Castillo)

CIUDAD HIDALGO, Mexico (AP) — The latest on the caravan of Central American migrants hoping to reach the United States (all times local):

5:30 p.m.

Mexico’s president-elect says he is suggesting to U.S. President Donald Trump that the United States, Canada and Mexico jointly tackle migration by agreeing to invest in development.

Andres Manuel Lopez Obrador says the countries ought to reach a deal to invest in Central America and southern Mexico, which are home to come of the region’s poorest areas.

Lopez Obrador made the comment Sunday as thousands of Honduran migrants streamed through southern Mexico hoping to reach the United States.

In the president-elect’s words: “He who leaves his town does not leave for pleasure but out of necessity.”

Lopez Obrador also reiterated promises of jobs in Mexico for Central American migrants fleeing poverty and violence.

He takes office Dec. 1.

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2:45 p.m.

U.S. President Donald Trump is again hammering the Democratic Party over a mass caravan of Honduran migrants that has resumed its northward march through Mexico.

Trump has seized on the caravan and border security in general as a campaign issue ahead of midterm elections in early November, and on Sunday afternoon he let loose anew.

The president tweeted: “The Caravans are a disgrace to the Democrat Party. Change the immigration laws NOW!”

On Thursday, the president tweeted that the caravan was the “Democrats fault for weak laws!”

In a separate tweet Sunday, Trump said: “Full efforts are being made to stop the onslaught of illegal aliens from crossing our Souther (sic) Border.”

Trump added that the United States will turn migrants away if they do not apply for asylum first in Mexico.

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2:25 p.m.

The caravan of thousands of Honduran migrants wending its way through Mexico has grown more stretched out in the blazing sun, evolving into long lines straggling for miles.

Mexican villagers have organized to offer them water, food and clothing. Dozens of Mexicans in pickup trucks have pulled over to let 10 or even 20 migrants hop in back.

One of the drivers is Jesus Valdivia, a resident of Tuxtla Chico, Mexico. He says it’s important to help others: “Today it’s for them, tomorrow for us.”

Passing freight trucks were quickly boarded by dozens of migrants, and groaning tuk-tuks carried as many as a half-dozen.

Brenda Sanchez of San Pedro Sula rode in Valdivia’s truck Sunday with three nephews aged 10 to 19. She expressed gratitude to “God and the Mexicans who have helped us.”

Sanchez also had kind words for federal police, who previously had stopped the caravan at the Guatemalan border.

As she put it: “Even though they closed the doors to us, they are coming behind us taking care of us.”

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10:20 a.m.

About 500 Mexican federal police are beside a highway that a caravan of Central American migrants is marching along toward the city of Tapachula.

The majority are on buses with their tactical gear. Others have been buying snacks in convenience stores. After settling in at one post well ahead of the caravan, the police then moved back closer to Tapachula.

Officers who would not identify themselves say their instructions are to maintain the flow of traffic, not to stop the caravan. They were not blocking the highway.

Some 5,000 Central American migrants traveling in the caravan left the border at Ciudad Hidalgo at dawn. Most had circumvented Mexican immigration officials and crossed the Suchiate river from Guatemala on rafts or by swimming.

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9:10 a.m.

Three federal police units are escorting the massive crowd of migrants marching across southernmost Mexico and a police helicopter has been flying overhead. It’s not immediately clear if Mexican authorities plan again to try to stop the march, which has swelled to some 5,000 people.

Municipal police in the town of Frontera Hidalgo stood by. City police officer Luis Fernando Mejia Morales said “the instructions are to treat them kindly. They are human beings.”

People in the town were sympathetic to the migrants. Some prepared tubs full of plastic bags of water to give the migrants, who by now are walking under a blazing sun.

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7:40 a.m.

A migrant caravan whose numbers swelled overnight to an estimated 5,000 people at the Mexico-Guatemala border has resumed its march toward the U.S. frontier.

The migrants had grown frustrated with Mexico’s attempts to process them and circumvented authorities by crossing the Suchiate river illegally.

They have begun walking out of the border city of Ciudad Hidalgo at first light Sunday morning, headed 10 abreast for their next stop: the city of Tapachula.

It’s not immediately clear where the additional travelers materialized from.

But during a caravan last spring, many migrants who had been working and living at the Guatemala-Mexico border decided to join the caravan when it passed because it was safer to travel together.

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5 a.m.

Despite Mexican efforts to stop them at the border, about 2,000 Central American migrants swam or rafted across a river separating that country from Guatemala, re-formed their mass caravan in Mexico and vowed to resume their journey toward the United States.

The migrants say they gave up trying to enter Mexico legally because the asylum application process was too slow. They gathered Saturday at a park in the border city of Ciudad Hidalgo and voted by a show of hands to continue north en masse, then marched to the bridge crossing the Suchiate River and urged those still on it to come join them.

The decision to re-form the migrant caravan Saturday capped a day in which Mexican authorities again refused mass entry to migrants on the bridge. Instead they accepted small groups for asylum processing and giving out 45-day visitor permits to some.