CIUDAD HIDALGO, Mexico — 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, who said they gave up trying to enter Mexico legally because the asylum application process was too slow, gathered Saturday at a park in the border city of Ciudad Hidalgo. They 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.

“We are going to reach the United States,” said Erasmo Duarte, a migrant from Danli, Honduras, despite warnings to turn back this week from U.S. President Donald Trump, who has sought to make the caravan and border security into a campaign issue before the U.S. midterm election in November.

The decision to re-form the migrant caravan capped a day in which Mexican authorities again refused mass entry to migrants on the bridge, instead accepting small groups for asylum processing and giving out 45-day visitor permits to some. Authorities handed out numbers for people to be processed in a strategy seen before at U.S. border posts when dealing with large numbers of migrants.

But many became impatient and circumventing the border gate, crossing the river on rafts, by swimming or by wading in full view of the hundreds of Mexican police manning the blockade on the bridge. Some paid locals the equivalent of $1.25 to ferry them across the muddy waters. They were not detained on reaching the Mexican bank.

“We couldn’t wait because we had already waited too long and they only told us lies,” said Duarte, who joined the caravan with his wife and children six days ago.

Sairy Bueso, a 24-year old Honduran mother of two, was another migrant who abandoned the bridge and crossed into Mexico via the river. She clutched her 2-year-old daughter Dayani, who had recently had a heart operation, as she got off a raft.

“The girl suffered greatly because of all the people crowded” on the bridge, Bueso said. “There are risks that we must take for the good of our children.”

Group leaders said the caravan, which will be smaller than the original one, would strike out Sunday morning for the city of Tapachula.

Where easily 3,000 people were on the bridge the previous day, the crowd had thinned out considerably by Saturday. In addition to those who crossed the river, immigration agents processed migrants in small groups and then bused them to an open-air, metal-roof fairground in Tapachula, where the Red Cross set up small blue tents on the concrete floor.

Each time a small side gate opened to allow people to pass for processing, there was a crush of bodies as migrants desperately pushed forward. Scarleth Cruz hoisted a crying, sweat-soaked baby girl above the crowd, crying out: “This girl is suffocating.”

Cruz, 20, said she was going to ask for political asylum because of threats and repression she faced back in Honduras from President Juan Orlando Hernandez’s governing party.

“Why would I want to go to the United States if I’m going to be persecuted” there as well, she said.

Mexico’s Interior Department said it had received 640 refugee requests by Hondurans at the border crossing. It released photos of migrants getting off buses at a shelter and receiving food and medical attention.

At least half a dozen migrants fainted in the crush.

Some tore open a fence on the Guatemala side of the bridge and threw two young children, perhaps age 6 or 7, and their mother into the muddy waters about 40 feet below. They were rafted to safety in on the Mexican bank.

Mexican workers handed food and bottled water to the migrants on the bridge. Through the bars, a doctor gave medical attention to a woman who feared her young son was running a fever.

Sustenance also came from Guatemalan locals — for Carlos Martinez, a 24-year-old from Santa Barbara, Honduras, the plate of chicken with rice was the first bite to eat he’d had all day.

“It is a blessing that they have given us food,” Martinez said. “It gives me courage to keep waiting, as long as I can.”

Migrants cited widespread poverty and gang violence in Honduras, one of the world’s deadliest nations by homicide rate, as their reasons for joining the caravan.

“One cannot live back there,” said Fidelina Vasquez, a grandmother travelling with her daughter and 2-year-old grandson, standing next to the main border gate.

The caravan elicited a series of angry tweets and warnings from Trump early in the week, but Mexico’s handling of the migrants at it southern border seems to have satisfied him more recently.

“So as of this moment, I thank Mexico,” Trump said Friday at an event in Scottsdale, Arizona. “I hope they continue. But as of this moment, I thank Mexico. If that doesn’t work out, we’re calling up the military — not the Guard.”

“They’re not coming into this country,” Trump added.

“The Mexican Government is fully engaged in finding a solution that encourages safe, secure, and orderly migration,” State Department Spokeswoman Heather Nauert said Saturday, “and both the United States and Mexico continue to work with Central American governments to address the economic, security, and governance drivers of illegal immigration.”

After an emergency meeting in Guatemala, presidents Hernandez of Honduras and Jimmy Morales of Guatemala said an estimated 5,400 migrants had entered Guatemala since the caravan was announced a week ago, and about 2,000 Hondurans have returned voluntarily.

Morales said a Honduran migrant died in the town of Villa Nueva, 20 miles (30 kilometres) from Guatemala City, when he fell from a truck.

Some Hondurans were weary of the journey and disappointed by the violence at the crossing, and just wanted to head home.

“We thought the caravan was passive but there were unruly people, I was disappointed,” said Gonzalo Martinez, a 37-year-old farmer, as he boarded a bus in Tecun Uman, Guatemala to take him back to Honduras.

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Mark Stevenson reported from Ciudad Hidalgo, and Sonia Perez D. reported from Tecun Uman, Guatemala. Associated Press writers Sonny Figueroa in Guatemala City and Peter Orsi in Mexico City contributed to this report.

Mark Stevenson And Sonia Perez D., The Associated Press