US President Donald Trump issued a stern warning on Twitter to illegal immigrants who enter the United States.
Warning them of arrest, Trump tweeted that those entering the US illegally will be arrested and detained, prior to being sent back to their country.
He was refering to the influx of people from several Central and South American nations.
Issuing a warning to the governments of El Salvador, Guatemala and Honduras, Trump said, "We have today informed the countries of Honduras, Guatemala and El Salvador that if they allow their citizens, or others, to journey through their borders and up to the United States, with the intention of entering our country illegally, all payments made to them will STOP (sic)."
Following the tweet, the organizer of a migrant caravan from Honduras was detained on Tuesday in Guatemala as the U.S. government threatened to withdraw aid from both countries and El Salvador if the flow of migrants north to the United States was not stopped.
Up to 3,000 migrants, according to organizers' estimates, crossed from Honduras into Guatemala on a trek northward, after a standoff on Monday with police in riot gear.
The Honduran Foreign Ministry called on its citizens not to join the group. The government "urges the Hondurans taking part in this irregular mobilization not to be used by a movement that is clearly political," it said.
Over the border, Guatemalan police officers detained Bartolo Fuentes, a former Honduran lawmaker, from the middle of the large crowd that he and three other organizers had led from San Pedro Sula, Honduras, since Saturday.
The moves followed comments by U.S. President Donald Trump that indicated his administration would halt aid if the Central American governments did not act, his latest effort to demonstrate his tough stance on immigration.
The Honduran security ministry said Fuentes had been detained because he "did not comply with Guatemalan immigration rules" and would be deported back to Honduras in the coming hours.
Security officials at the Honduran border with Guatemala in Agua Caliente blocked the road to prevent another much smaller group getting through, television images from the border showed.
"We can't attend to people en masse. People are going through one by one," said police spokesman Alex Madrid, in a radio interview.
Guatemala's government said it did not have official figures for how many migrants from the caravan had already crossed the border.
Adult citizens of the countries of Guatemala, Honduras, El Salvador and Nicaragua need only present national identity cards to cross each others' borders. That rule does not apply when they reach Mexico.
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 "A Honduran migrant girl cries while on her way to the United States, in Rio Hondo, Zacapa, Guatemala")
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