One of the migrants at a temporary shelter in Tijuana, Mexico.
President Donald Trump called on the Mexican government to do more to stop migrants approaching the US border, warning on Monday that he might permanently shut down entry if necessary.
Sarmiento said she had been near the bottom of the Tijuana River when USA agents fired tear gas.
Most of the migrants stumbled back into camp in the northwestern Mexican city of Tijuana, dirty, scared and with ripped clothes. Among those affected were pregnant women and children, according to Honduran migrant Myrna Lissete Amaya, who said some of the younger kids fainted.
"We were deluded into believing that we had already reached the United States, and that they would grant us asylum", Colon told AFP.
US border agents shot several rounds of tear gas after some migrants attempted to penetrate various points along the border and threw what appeared to be rocks at USA authorities.
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For the past several weeks, President Donald Trump has warned the migrant caravan members, again reiterating his stance on Nov 26.
He wrote on Twitter, "Mexico should move the flag waving Migrants, many of whom are stone cold criminals, back to their countries". Trump portrays them as a threat to USA national security, intent on exploiting America's asylum law, but others insist he is exaggerating to stoke fears and achieve his political goals.
Scott also said agents only resorted to using tear gas to deter migrants after members began to pelt USA officials with rocks. "Congress, fund the WALL!". On Saturday, Mr. Trump also tweeted that migrants attempting to apply for asylum at the southern border will not be allowed to stay in the USA and will instead have to wait in Mexico while their claims are being processed. It is the most heavily trafficked land border in the western hemisphere.
At least 500 migrants, including women and children, had been taking part in a peaceful demonstration in Tijuana before dashing towards the border in an attempt to clamber over a first metal fence.
The sudden rush overwhelmed Mexican police, who were deployed with large clear shields and full riot gear. The military's role is limited largely to erecting barriers along the border and providing transportation and logistical support to Customs and Border Protection.
"We've got to look at the facts here. These are people, they call them 'grabbers, ' they grab a child because they think they're going to have a certain status by having a child".
Shortly after Ms Meza arrived she was confronted by a blocked of Mexican police, who shot tear canisters in range of children and teenagers. He also described CBP as having responded with use of force to primarily adult males throwing rocks.
A third man, who wished to remain unnamed, showed AFP what he described as injuries from rubber bullets.