US President Donald Trump has taken a hard line toward the first caravan, threatening to deploy US Army troops along the border to prevent entry and saying he will significantly cut economic aid to Guatemala, Honduras and El Salvador in reprisal for their inability to halt the migrants.
Raul Medina Melendez, security chief for the tiny municipality in Oaxaca state, said the town was distributing sandwiches and water to migrants camped in the central square Saturday night when a man with a megaphone asked people to wait their turn.
Several people showed signs of being affected by the gas but no-one was injured, Guatemalan authorities said.
A family walks among other migrants in the Central American migrant caravan that slowly making its way toward the US border, outside Arriaga.
The caravan is now trying to strike out for Tapanatepec, about 29 miles (46 kilometers) away. "We've thought about going before, but now we finally have the opportunity", said 18-year-old Dalila Abigail Landaverde, who is travelling with her partner and their three-year-old daughter, Tatiana.
"Our destiny is to get to the border", said Orellana, who left three children behind in San Pedro Sula.
Navarrete said Mexico was in communication with Central American governments about the disturbances and "rejects the displays of violence that occurred today at the border with Guatemala". Her claims could not be verified, but migrants' representatives in the talks asked the Mexican government to provide a list of anyone who had been forced to return.
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Eduardo Grajales, a Red Cross volunteer in Arriaga, Mexico, attending to migrants on Friday night, said the worst case his colleagues had seen that day was of a baby so badly sunburned from the tropical heat, he had to be hospitalized. Women carrying children or pushing strollers are at a disadvantage.
Guatemalan volunteer firefighters said they tried to treat the man Sunday but the injury apparently from a rubber bullet was too severe. Rojas transported the group to their destination after spotting them on a highway trudging through temperatures approaching 104 degrees Fahrenheit (40 degrees Celsius).
Police have also been ejecting paid migrant passengers off buses, enforcing an obscure road insurance regulation to make it tougher for them to travel that way. Mexican officials broke up a second, smaller group of 200 to 300, arresting more than 100 for deportation.
The National Guard is often used by states to help with border security. If they manage to catch up to the main body of the original caravan north of Tepanatepec they will no doubt blend into the massive crowd and disappear.
Migrants, who are part of a caravan of Central Americans trying to reach the US border, bathe and wash clothes in the Novillero River in Tapanatepec, Mexico, today.
While such migrant caravans have taken place regularly over the years, passing largely unnoticed, they have received widespread attention this year with Trump's rhetoric.
Trump and his fellow Republicans have sought to make immigration a major issue before the November 6 elections, in which the party is battling to keep control of Congress.
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