U.S. intelligence agencies intercepted an encrypted Iranian signal that federal officials believe could be linked to the activation of dormant operatives inside the United States, according to threat ...

Trump claimed the U.S. knows where Iranian sleeper cells are. The press corps heard it, noted it, and moved on without asking ...

The death of Iran’s Supreme Leader Ali Khamenei on February 28 has reportedly triggered a series of covert communications that have raised concerns among intelligence agencies across the world.

Several people on social media expressed fears about possible sleeper cell attacks amid reports that Iran's Khamenei was dead ...

WPBF 25 News sat down with a former FBI agent who explained what 'sleeper cells' are and how good they are at blending in.

As tensions rise overseas, some U.S. officials are warning about the potential for "sleeper cell" attacks inside the U.S.

President Donald Trump on Wednesday said that United States authorities know the location of “most” suspected Iranian sleeper cells in the country, as officials have warned about political retaliation ...

Its power has long rested on a network of intelligence operations, ideological militias, covert sleeper cells, cyber units, and global propaganda systems. Even if missile launchers, naval vessels, and ...

How to bring the war home to an increasingly war-weary public? Tell them terrorists are “hiding in plain sight.” ...