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(CNSNews.com) -- On Nov. 12 and 13, U.S. Border Patrol agents captured 654 illegal aliens in Yuma, Arizona who had illegally entered the United States through "outdated border wall infrastructure," reported U.S. Customs and Border Protection (CBP) on Wednesday.

The illegals were mostly Guatemalan nationals, family units and unaccompanied juveniles. They are not believed to be part of the large caravan of people heading for the border, said the CBP.

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"The groups illegally entered on both sides of the San Luis Port of Entry where there is outdated border wall infrastructure," reported the agency. "Larger numbers have started to illegally cross shallow portions of the Colorado River near Yuma."

In addition, "a group of 55 Central Americans waded across the [Colorado] river near County 9th Street and surrendered to agents after walking around vehicle barriers," said the CBP. "The area lacks infrastructure that would deter pedestrian entries."

The agency reported that year-to-date apprehensions in the Yuma Sector "are up over 150% compared to this date in Fiscal Year 2018." Also, total FY 2018 numbers were "more than double total" FY 2017 numbers.