A newly intercepted encrypted transmission believed to have originated from Iran has sparked concerns among Western intelligence agencies that Tehran may be attempting to activate covert operatives abroad following the reported death of Supreme Leader Ali Khamenei.
According to reports citing U.S. intelligence sources, the coded signal was detected shortly after Khamenei’s death on February 28. The transmission, which was reportedly broadcast repeatedly from a mysterious radio station, is believed to have been intended for clandestine recipients who possess the encryption key necessary to decode its instructions. Authorities suspect the message could serve as an operational trigger for so-called “sleeper assets” — covert operatives embedded in foreign countries who remain inactive for long periods until they receive specific commands.
The development comes at a time of rapidly escalating tensions between Iran, the United States, and Israel, following days of intense military exchanges across the Middle East.
Intercepted Message Raises Alarm
According to a report by ABC News, U.S. intelligence agencies intercepted the encrypted broadcast while monitoring radio-frequency transmissions originating from Iran. The signal was unusual in that it did not rely on internet-based communication channels or standard telecommunications networks.
Instead, the transmission appeared to be delivered via shortwave radio frequencies, a method historically used by intelligence services to communicate with covert agents operating overseas. Such broadcasts typically contain coded instructions that can only be deciphered by recipients possessing the correct encryption keys.
A federal alert circulated among American law enforcement agencies warned that the signal could potentially be intended to “activate or provide instructions to prepositioned sleeper assets operating outside the originating country.” The alert emphasized that while the exact content of the message has not yet been decoded, the sudden emergence of a new broadcast station with international transmission capabilities has raised significant security concerns.
Officials said the station repeatedly transmitted the encrypted message to multiple regions around the world, suggesting the communication may have been aimed at operatives stationed in several countries.
Heightened Security in the United States
In response to the intercepted transmission, U.S. authorities have increased security measures and instructed law enforcement agencies to closely monitor unusual radio-frequency activity.
Counterterrorism experts say the possibility of retaliatory attacks by Iran-linked groups cannot be ruled out, especially as the conflict in the Middle East intensifies.
Former FBI assistant director Chris Swecker warned that the current geopolitical environment could increase the likelihood of militant networks attempting operations abroad.
“If there was ever a moment when a Hezbollah or Hamas-linked cell might attempt a violent act inside the United States, it would be during a period of active military conflict,” Swecker said during a television interview.
Following U.S. strikes against Iranian targets, Kash Patel announced that counterterrorism and intelligence teams had been placed on high alert.
Local authorities in major American cities including New York City, Los Angeles, and Miami have also strengthened patrols around potential targets. These include places of worship, cultural institutions, public events, and educational facilities.
Officials stress that there is currently no confirmed threat tied to any specific location, but the precautionary measures are aimed at preventing potential attacks.
Escalating Conflict in the Middle East
The intelligence alert comes amid a rapidly escalating conflict involving Iran, the United States, and Israel.
Over the past week, U.S. and Israeli forces have carried out a series of airstrikes on Iranian military facilities and strategic infrastructure. In response, Iran has launched retaliatory attacks targeting Israeli positions and U.S. military assets across the region.
Meanwhile, Iran-backed groups such as Hezbollah have also become increasingly active. From southern Lebanon, the group has launched multiple rocket attacks into Israeli territory, further widening the scope of the conflict.
The situation has raised fears that the war could expand beyond the Middle East and potentially involve covert operations in other parts of the world.
Global Intelligence Monitoring Situation
Intelligence agencies across several countries are now closely monitoring communications and suspicious activity that could be linked to Iranian networks.
Experts note that sleeper cells are designed to blend into local populations and may remain inactive for years until they receive a signal to act. Historically, intelligence services have used encrypted radio broadcasts as a secure way to send instructions to such operatives without relying on digital networks that could be easily traced.
Despite the heightened concern, U.S. officials have emphasized that there is currently no direct evidence that an attack is imminent.
Nevertheless, the discovery of the encrypted broadcast has added another layer of tension to an already volatile geopolitical environment.
As investigations continue, security agencies worldwide remain vigilant, attempting to determine whether the mysterious signal represents a routine intelligence communication — or the first step in a broader covert operation linked to the ongoing conflict.