McALLEN, Texas (Border Report) -- U.S. Immigration and Customs Enforcement is increasing the use of ankle monitors, an older form of technology for migrants not in detention facilities while their immigration cases are under review, according to an analysis of new data by Border Report.

As of Saturday, the number of migrants on ankle monitors was 29,089 nationwide, according to the latest ICE data published on the agency's website.

That's up from 28,070 migrants on ankle monitors as of Aug. 23 in the agency's Alternatives to Detention program, according to data from Transactional Records Access Clearinghouse (TRAC).

The ankle monitors use satellite GPS technology, according to ICE.

The number of migrants monitored via the SmartLINK app decreased from 150,784 as of Aug. 23, to 148,717 a

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