The thousands of predominantly Central American migrants who have died or gone missing on the journey to the US are among 56,800 people-including refugees and asylum seekers-worldwide who have died or disappeared since 2014, the AP has found in a separate report.
The group was observed coming down on the U.S. side of the wall by a Border Patrol camera operator.
It was not clear whether the group would face charges and deportation or if they had requested asylum in the United States.
In the area around the U.S. -Mexico border, the Missing Migrants Project recorded 364 deaths in 2018 alone, with 97 of those who died having come from Latin America and the Caribbean, while 77 were from Central America.
McAleenan has been overseeing the US southern border where more than 7,000 migrants have gathered near Tijuana, Mexico.
The crossings started just before dusk when "three thin people" managed to "squeeze through the fence on the beach".
This problem, according to McAleenan, stems from weak immigration laws in the US leading migrant families to believe that they cross the border when they don't have valid asylum claims.
Qualcomm Unveils Snapdragon 855 Processor for 5G Phones
There has been a lot of speculations about the name of the flagship Mobile Solution from Qualcomm. For now, it is not known if any companies have adopted Qualcomm's new sensor for their products.
Earlier, Karen Mayeni, a 29-year-old Honduran, sized up the fence while clinging to her three children, aged six, 11 and 12.
One child and his mother got over the fence and ran up the hill behind.
Some migrants may hope to defeat the odds and penetrate one of the most fortified sections of the southern USA border. The woman said she would decide her family's next action "in a couple of days".
He told Fox News that Tijuana can not continue providing support for the migrants, saying the city's resources have been depleted.
"We have a challenging and still potentially volatile situation in Tijuana". Mexican authorities arrested and deported those they considered responsible for compromising the city's commitment to public order.
"They see what we have here, so they're trying to do the same thing", local resident Mary Juarez, who lives in the neighborhood next to the fence opening, told KVIA. Those individuals were also apprehended and taken into custody "for appropriate processing", he told Fox News' Bill Hemmer. "It's a huge challenge that we need to work with Congress to address", he explained.