An AFP journalist reported the crowd size at about 100 and observed the group of Central Americans gathering around 8:00 pm Monday night (0400 GMT Tuesday) in an area called Playas de Tijuana on the Pacific coast, often used by migrants as a departure point for attempts to sneak across the border.
Some migrants began throwing rocks over the fence at agents and officers, according to the agency. Twenty-five people were arrested after crossing into the USA, including two teenagers.
U.S. Customs and Border Protection said in a statement that about 45 migrants got through the first layer of fencing but turned back when they saw the border patrol's presence early Tuesday. They spotted this caravan because of increased security at the border.
"Shortly thereafter, migrants began throwing rocks over the fence at the CBP agents and officers".
The Border Patrol used tear gas against a storm of illegal immigrants November 25, prompting criticism from some Democrats, including one senator who suggested the chemical deterrent violated worldwide law.
The AP saw rocks thrown only after US agents fired the tear gas. "However, this incident needs to be examined within the broader context of United States policies at the border".
Per use of force policy, the incident will be reviewed by the Border Patrol's Office of Professional Responsibility.
American police officers fired tear gas, pepper spray and smoke at the Mexican border in an attempt to deter more than 100 migrants from entering the USA illegally. CBP argued that none of the crossing migrants, including children, suffered from the effects of gas, as the targeted perpetrators stood further away from the fence.
Migrants, part of a caravan of thousands traveling from Central America en route to the United States, go down a hill after failing to cross the border between the U.S and Mexico in Tijuana, Mexico Nov. 25, 2018.
President Trump is now locked in a fight with congressional Democrats over funding for the border wall that he wants to build.
Waldman, however, used the incident on January 1, to prop up US President Donald Trump's idea of a $5bn border fence on the border with Mexico.
With little time left until Democrats officially take over the House on Thursday, Trump reportedly called for a border security briefing at a White House on Wednesday to discuss the stalemate with leaders of Republicans and Democrats in both congressional chambers.