About 1,000 migrants decide to pause their march, hoping to get some sort of temporary exit visa while 2,000 others continue their walk in US direction.
Humanitarian visas will allow migrants to stay in Mexico for 30 days without fear of being deported, officials and an NGO say.
Thousands of migrants reach Huixtla town, some 40 km from where they started on Monday as some regional leaders meet at Summit of the Americas to hammer out deal on managing migrant flows.
Central American migrants march through Mexico City to demand the Mexican government give them permanent residence and allow them to reach the US border.
The decision was a blow to refugee advocates who had wanted US President Joe Biden to move swiftly to reverse the policies of his Republican predecessor, Donald Trump, who had set the 15,000 cap as a way to limit immigration.
Guatemala blocks part of caravan of migrants who're trying to reach United States to escape poverty, unemployment, and aftermath of two devastating hurricanes amid coronavirus pandemic.
Standing on the wall above the Rodolfo Robles International Bridge that connects Mexico with its southern neighbour, National Guard General Vincente Hernandez told migrants they would be allowed to cross the border in a "controlled" manner.
Close to 1,000 people gather in Honduras' second largest city forming a migrant caravan that will soon head for the US, as Guatemala leader says Mexico plans to contain the migrants.
If the two countries cannot reach an agreement, a five percent tariff on all Mexican goods entering the US will go into effect on Monday.
The Central American migrants are heading north towards the United States. The migrants are mainly from Honduras and are being monitored by a municipal police patrol.
As Trump continues to insist on the need for a border wall, thousands of people from Honduras, Guatemala and El Salvador have been arriving in Mexico with the aim of getting into the US. Most of them say they are fleeing violence.
US Customs and Border Protection said in a statement later that the gas was used to target rock throwers apart from the migrants who were trying to cross.
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