Iran Sends Encrypted Signal To Activate Sleeper Cells Abroad After Khamenei's Death
Key Takeaways
- U.S. intercepted encrypted communications believed to be an Iranian operational trigger activating sleeper assets
- Signal was transmitted internationally shortly after Ali Khamenei's reported death on February 28
- Federal law enforcement alert advised monitoring suspicious activity, but no specific immediate targets were identified
Encrypted transmission alert
U.S. intelligence agencies intercepted an encrypted radio transmission shortly after the reported Feb. 28 death of Iran's Supreme Leader Ali Khamenei.
“Iran may be activating sleeper cells outside the country, alert says The encrypted transmission was intercepted by the U”
Federal authorities characterized the transmission as an "operational trigger" potentially intended to activate prepositioned covert operatives or "sleeper assets" abroad.
Multiple outlets reported the alert was circulated to law enforcement and cited ABC News as the source for the intelligence assessment, which described the coded signal as holding instructions for clandestine recipients and timed to follow Khamenei's reported death.
Encrypted radio rebroadcast alert
Reporting indicates the transmission was repeatedly rebroadcast by a newly observed station outside Iran.
It possessed international rebroadcast characteristics and appeared aimed at recipients with decryption keys, a technique noted as a way to pass instructions without internet or mobile networks.
The bulletin urged heightened monitoring of unusual radio-frequency activity across several countries and emphasized that the messages required decryption keys and were not simple public broadcasts.
Regional strikes and casualties
The alert arrives amid intensified regional fighting and reciprocal strikes.
“After Khamenei's death, Iran sent signal to activate sleeper cells: Report While no immediate threat to specific locations has been identified, law enforcement agencies are advised to monitor suspicious activity”
Outlets report Israeli strikes on Iranian and Hezbollah sites, and Iranian missile and drone attacks on Israel and countries hosting U.S. forces, with rising civilian casualties reported.
Coverage notes specific casualties in the wider region and official acknowledgements such as the U.S. confirmation of the seventh American soldier’s death and President Trump's public statements about tracking sleeper agents and operations against Iranian capabilities.
U.S. response to broadcasts
U.S. authorities balanced caution with readiness: while counterintelligence experts warned of potential revenge attacks and law enforcement were urged to monitor suspicious broadcasts, the alert repeatedly stated there was no known, location-specific threat or solid proof linking the transmissions to particular plots.
U.S. agencies, including the FBI, mobilized counterterrorism and intelligence teams to increase situational awareness, reflecting a posture of heightened vigilance rather than confirmed imminent danger.
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