Statistics released by the federal agency show that 10,588 UACs were apprehended at the nation’s southern border with Mexico compared to the first two months of FY2015, when 5,129 UACs were taken into custody.

The surge in unaccompanied minors was concentrated in two sectors – Big Bend in Texas and Yuma in Arizona– which both saw a more than 500 percent increase in the number of UACs crossing into the U.S. illegally. The El Paso sector was next, reporting a 250 percent increase.

The statistics also show an even larger surge in the number of family units apprehended at the border – a 173 percent increase so far in the first two months of FY2016.

According to statistics from FY2015 (Oct. 1 to Nov. 30, 2014) 4,577 family units were apprehended at the southwest border, compared to 12,505 during the same period in FY2016.