(NewsNation) — U.S. intelligence officials are warning about a possible signal from Iran that could be intended to serve as an “operational trigger” to activate “sleeper assets” aboard amid the ...

Intelligence experts say that although rhetoric around Iranian sleeper cells has increased since the U.S.-Israel war on Iran, ...

(NewsNation) — As tensions escalate between the United States and Iran, the threat of sleeper cells has “never been higher,” according to U.S. Customs and Border Protection, although no specific or ...

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. In a memo obtained by NewsNation, CBP ...