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Members of a 3,000-strong migrant caravan have massed in this Guatemalan border town across the muddy Suchiate River from Mexico, as U.S. President Donald Trump threatens retaliation if they continue toward the United States.

The first members of the group began arriving in Tecun Uman on buses and trucks early Thursday, but the bulk of the caravan sloshed into town on foot in a downpour late in the afternoon and into the evening. Hundreds walked to the river’s edge where they sang the national anthems of Honduras and Guatemala.

A smaller group walked to the border crossing but was blocked by Guatemalan police. They eventually retreated to await the rest of the caravan.

The exhausted travellers, the majority from Honduras, dispersed to the local migrant shelter and parks where volunteers offered them food.

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WATCH : Several thousand Honduran migrants moved through Guatemala this week on their way toward the United States.

1:39 Caravan of migrants moves through Guatemala Caravan of migrants moves through Guatemala

Jonathan Perales, 22, arrived with his wife Heidy and their daughters ages 2 and 4. They’d been travelling since 4 a.m. and arrived at the border after dark. They paid for bus tickets they could ill afford.

“It was a great sacrifice, but it’s all for a better life,” he said.

“It’s not all good. We’re wet and we still don’t have a place to sleep.” Tweet This

On the Mexican side, the foreign ministry said its government was in constant communication with members of the caravan explaining the migrants’ options. It said officials were already assisting some migrants who had crossed and requested refugee status.

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Trump has made it clear to Mexico that he is monitoring its response. Early Thursday, he threatened to close the U.S. border if Mexico let the migrants advance. Later, he retweeted a video of Mexican federal police arriving at the Guatemalan border and wrote: “Thank you Mexico, we look forward to working with you!”

Two busloads of those police were visible on the Mexican side of the bridge from Tecun Uman Thursday. Metal barricades were stored to one side, but not yet deployed.

Edgar Corzo of Mexico’s National Human Rights Commission expressed concern about the police deployment in Ciudad Hidalgo.

“We hope that the immigration officials and federal police have a humanitarian understanding,” Corzo said. He said they were “worried that things could escape rational margins.”

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Mexico’s southern border is notoriously porous and it was unclear how many of the migrants would attempt to cross legally at the bridge.

Some migrants crossed the river at a point where they could walk through shallow water Thursday, Corzo said. Others could opt for the rafts that ferry people — and historically migrants — daily across the river.

“How they’re going to cross is what we’re anxious about,” Corzo said. Tweet This

Tensions rose Thursday when an immigration activist who led a migrant caravan through Mexico last spring was arrested by federal police and immigration agents in Ciudad Hidalgo on the Mexican side of the border.

Irineo Mujica’s organization, Pueblo sin Fronteras or People without Borders, said he was detained during a peaceful march. Video circulating on social media saw several police and immigration agents pushing Mujica into an immigration agency van in a crowd of people. Mujica appeared to be resisting.

Corzo said police accused Mujica of slashing the tires of an immigration vehicle. Immigration officials said later in a statement that Mujica, who has dual U.S.-Mexican citizenship, is accused of property damage. It said Mujica attacked immigration agents, as well as local and federal police, after he was asked for his identification.

READ MORE: Trump appears to threaten USMCA deal when lashing out at migrant caravan

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Mexico has said the Hondurans would not be allowed to enter as a group and would either have to show a passport and visa — something few have — or apply individually for refugee status, a process that can mean waiting for up to 90 days for approval. They also said migrants caught without papers would be deported.

Thursday night, a man from Pueblo Sin Fronteras who did not give his name, told migrants in Tecun Uman that they would try to cross en masse on Saturday morning.

In April, Mexican immigration officials had some success in dispersing the smaller caravan by processing many who decided to seek refugee status in Mexico, but some did continue on to the U.S. border where they were processed over several days.

WATCH ABOVE: Honduran troops and police block a migrant caravan from crossing the border into Guatemala

1:31 Honduran migrants push through Guatemalan jungle as Trump threatens to send military Honduran migrants push through Guatemalan jungle as Trump threatens to send military

Three weeks before U.S. midterm elections, Trump has seized on the caravan as a political winner for Republicans.

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Early Thursday he tweeted: “I must, in the strongest of terms, ask Mexico to stop this onslaught — and if unable to do so I will call up the U.S. Military and CLOSE OUR SOUTHERN BORDER!” Trump tweeted, adding that he blamed Democrats for what he called “weak laws!”

….In addition to stopping all payments to these countries, which seem to have almost no control over their population, I must, in the strongest of terms, ask Mexico to stop this onslaught – and if unable to do so I will call up the U.S. Military and CLOSE OUR SOUTHERN BORDER!.. — Donald J. Trump (@realDonaldTrump) October 18, 2018

….The assault on our country at our Southern Border, including the Criminal elements and DRUGS pouring in, is far more important to me, as President, than Trade or the USMCA. Hopefully Mexico will stop this onslaught at their Northern Border. All Democrats fault for weak laws! — Donald J. Trump (@realDonaldTrump) October 18, 2018

Marcelo Ebrard, who is set to become foreign relations secretary when President-elect Andres Manuel Lopez Obrador takes office Dec. 1, said Trump’s tweets need to be understood in the context of the upcoming U.S. midterm elections.

“The electoral process is very near, so he is making a political calculation,” Ebrard said in an interview with Radio Centro.

Trump’s stance, he said, was “what he has always presented,” adding he saw “nothing surprising in it.”

WATCH: Mike Pompeo calls migrant caravan a ‘crisis’

0:47 Mike Pompeo calls migrant caravan a ‘crisis’ Mike Pompeo calls migrant caravan a ‘crisis’

Current Foreign Relations Secretary Luis Videgaray was also sanguine and viewed things through the lens of U.S. politics.

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“Nobody likes them (Trump’s comments). There’s no reason to give them greater transcendence or importance,” Videgaray said from the United Nations where he sought the world body’s help processing asylum requests from the migrants. “What is important to us is the migrants, respect for human rights, their due protection, particularly the most vulnerable.”

Like Guatemala and Honduras, Mexico is a country of many migrants, raising the question of whether the political will exists for a confrontation.

Lopez Obrador wants to avoid repression against migrants and also to avoid angering the United States. He said this week that Mexico would offer jobs to Central Americans.

“Anyone who wants to work in our country … will have a work visa,” he said.

Juan Escobar, 24, said he had heard about Trump’s comments but said they would not dissuade the migrants from continuing their journey.

“Only God on high can stop us,” Escobar said.