The migrants' arrival has been met by some opposition from people in Tijuana, where many shelters were already at capacity, and on the US side of the border by increased security measures that include members of the military deployed there by President Donald Trump.
Migrants were asked by police to turn back toward Mexico.
Protesters march along the USA side of the southern border during a rally to show solidarity with the migrant caravan on Sundayy, November 25, as US immigration agents deployed tear gas to disperse hundreds of migrants who rushed the border. Many were fleeing violence and poverty in Honduras in hopes of finding asylum in the US.
Children screamed and coughed in the mayhem of the tear gas.
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".
Needless to say, it's an intense scene.
The San Ysidro crossing is a large complex with multiple lanes of vehicle and pedestrian access points.
Milenio TV showed images of migrants climbing over fences and peeling back metal sheeting in an attempt to enter the US.
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The officer involved has been placed on administrative leave while the Jefferson County Sheriff's Office investigates. Thanksgiving Day at Riverchase Galleria in the town of Hoover, about 10 miles from Birmingham, local reports said.
Throughout the day, U.S. Customs and Border Protection helicopters flew overhead, while U.S. agents on foot watched beyond the wire fence in California.
The closures came after about 500 migrants overwhelmed police blockades at another crossing nearby and rushed toward the border, said freelance reporter Alfredo Alvarez, who was in the crowd.
"We can't have all these people here", Mujica said.
"There is no agreement of any sort between the incoming Mexican government and the USA government", future Interior Minister Olga Sanchez said in a statement.
Amnesty International said what happened Sunday was predictable after Trump ordered the troops to the border and said he told them that if a migrant throws a rock, "consider it a rifle".
Meanwhile, Republican Senator Lindsey Graham of SC, took to Twitter to accuse critics of having to "really hate President Donald Trump to not understand the problems created by the caravans". If they agreed to the "Remain in Mexico" policy, those caravan members - and nearly certainly many thousands more who are on their way to the US - would have to be cared for in Mexico while they await the outcome of their asylum requests.
Mexico's Interior Ministry said Sunday the country has sent 11,000 Central Americans back to their countries of origin since October 19, when the first caravan entered the country. News slowly spread as the Thanksgiving holiday weekend wrapped up and millions were traveling back home, but by Monday morning countless Americans expressed outrage.