He also accused people who are coordinating the caravan of intentionally displaying women and children to "pull the heartstrings of America", and said the media is playing along. At least one man was wounded. On the east side, some pulled back a panel of fencing made of Army surplus steel landing mats to create an opening of about 4 feet, through which a group of more than 30 people crossed, according to a USA official who was not authorized to discuss the matter publicly and spoke on condition of anonymity.
Geoffrey Hoffman, a professor and director of the University of Houston Law Center Immigration Clinic, which represents migrants applying for asylum, said the government would use it to push the argument that the migrants should remain in Mexico.
Trump made similar threats in October ahead of the midterm elections, warning that an approaching "caravan" of migrants posed a risk to United States security and claiming without evidence that criminals were among the group.
"And so they used tear gas", he added.
US President Donald Trump recently commented on the tear gas deployment, telling reporters on Monday that migrants forced the hand of the CBP. "This woman placed her own life and her children's lives in peril".
"We were deluded into believing that we had already reached the United States, and that they would grant us asylum", Colon told AFP.
Sunday's melee closed one of the world's busiest worldwide crossings, San Ysidro Port of Entry, near San Diego, to vehicle and pedestrian traffic for several hours.
Trump, who for weeks has been condemning the migrant caravan, lashed out once more.
On Monday, he tweeted: "Mexico should move the flag-waving Migrants, many of whom are stone cold criminals, back to their countries".
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He questioned why the Mexican government "allowed" the migrants to rush the border, as there was advance intelligence that it was going to happen.
The migrants, mostly Hondurans, have travelled to the border in large groups, or caravans and now number more than 8,000. The incident began with a march to the border that organizers said would be peaceful. The officers are trained to use tear gas for crowd control, The New York Times reported.
People covered their faces to protect themselves from the acrid gas, as mothers clutched their young children and fled back to Mexico for safety.
"But now it seems that they want to kill us, and we got very scared", said Jimenez.
Secretary of Homeland Security Kirstjen Nielsen released an official statement regarding the "migrant caravan" members attempting to enter the country illegally this week; saying her Department is prepared to "shut down" ports of entry due to "security concerns".
Many hope to apply for asylum in the United States but agents at the San Ysidro entry point are processing fewer than 100 asylum petitions a day.
Trump has deployed almost 6,000 troops, on top of more than 2,000 National Guardsmen, but Scott said the Department of Defense was not involved in Sunday's engagement.
Many of those in Tijuana have said they will wait there until they can seek asylum.