The mysterious Persian-language transmission began about 12 hours after the start of the US-Israeli bombing campaign against Iran. It was jammed five days later. Is it a coded message for US agents in ...

Sleeper cells are spies or terrorists who operate in the U.S. and Western countries and remain inactive until they’re ordered to act. Last year, experts who spoke with NewsNation warned that if the ...

The strikes on the Iranian regime have Americans on high alert about public safety and potential sleeper cell attacks.

US intelligence intercepted encrypted Iranian transmissions potentially activating sleeper cells after Khamenei's death, leading to violent incidents. Investigations are ongoing.

Sleeper cells are spies or terrorists who operate in rival countries and remain inactive until they're ordered to act.

Federal authorities warn that Iran could launch retaliatory strikes on American soil using sleeper cells, lone wolf sympathizers or cyberattacks.

Austin and New York City have both been hit by apparent pro-Islamic terrorist attacks in the past week.