[Carriage Hill]

These are probably ‘sleepers’ who’ve come across the Mexican border, and who are hiding in plain sight, waiting for their ‘go orders’.

Lots of articles on this Google Search about it:

https://www.google.com/search?client=opera&q=korans+on+mexican+border+crossing&sourceid=opera&ie=utf-8&oe=utf-8&channel=suggest

[Qiviut]

These are probably ‘sleepers’ who’ve come across the Mexican border

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Ever read Tom Clancy's "Teeth of the Tiger"? That's the scenario, but they're not 'sleepers' ... go directly to the target.