US border officials have said they have a limited capacity to process asylum seekers, up to 100 per day.
Tensions are at a boiling at the U.S. -Mexico border in California, where migrants have started to clash with border agents. who've also begun throwing tear gas at them and their children.
A Facebook page set up for the San Diego "March of Solidarity with the Refugee Caravan" suggests that more than 500 demonstrators attended the event, which was organized by several groups, including the Migrant and Refugee Solidarity Coalition, People Over Profits San Diego and Unión del Barrio.
Customs and Border Protection tweeted about the alleged use of tear gas.
As the chaos unfolded, shoppers just yards away on the USA side streamed in and out of an outlet mall, which eventually closed.
An estimated 8,200 migrants from the so-called caravans heading to the US from Central America are now in Mexico, authorities say.
USA authorities fired tear gas that wafted into Mexico and caused migrants to run from the fumes.
Yesterday, we covered a report in the Washington Post about a reported agreement reached between the incoming government of Mexican president-elect Andres Manuel Lopez Obrador and the Trump administration to have Mexico keep asylum-seekers on their side of the border until their cases are processed by USA immigration officials. All northbound and southbound traffic was halted for several hours. The border crossing was temporarily closed after the brief skirmish.
"We ran", a 23-year old Honduran woman told the Associated Press, "but when you run the gas asphyxiates you more".
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USA officials have said for months that they were working with Mexico to find solutions for what they have called a border crisis. "We are global workers!" "Those persons were stopped and turned back to Mexico".
In recent weeks, thousands of mostly Central American migrants have arrived in Tijuana by caravan.
Numerous migrants had gathered earlier in the day to protest against being forced to stay in Tijuana instead of being allowed to cross and seek asylum in the US.
Trump wrote on Twitter on Sunday that it "Would be very SMART if Mexico would stop the Caravans long before they get to our Southern Border, or if originating countries would not let them form".
Milenio TV showed images of migrants climbing over fences and peeling back metal sheeting in an attempt to enter the US.
Tijuana Mayor Juan Manuel Gastelum on Friday declared a humanitarian crisis in his border city of 1.6 million, which he says is struggling to accommodate the crush of migrants.
The president is putting more pressure on Mexico, warning that he might close the southern border "permanently" if necessary.
The Mexican Interior Ministry said Sunday that since October 19, it had sent almost 2,000 Central Americans who were part of recent caravans back to their countries.
Mexico is on track to send a total of around 100,000 Central Americans back home by the end of this year.