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.

Recent reporting indicates federal authorities have circulated a warning to law enforcement about an intercepted message believed to originate from Iran, possibly intended for operatives outside the ...

Rapid7 (NASDAQ: RPD), a global leader in AI-powered managed cybersecurity operations, released findings from a months-long research investigation from Rapid7 Labs, “Sleeper Cells in the Telecom ...

Sens. addressed "deeply concerning" potential for Iranian sleeper cells to unleash terror attacks on the US as hundreds entered under Biden.

The message was described by officials as a possible “operational trigger” directed at what analysts refer to as sleeper assets — individuals embedded in foreign countries w ...

The U.S. recently intercepted encrypted messages believed to be from Iran that could serve as an “operational trigger” for “sleeper assets,” according to a federal government alert sent to law ...

Terrorist “sleeper cells” possibly aided by Democrats’ open-border policies could be gearing up in the US to retaliate for the joint US-Israel airstrikes against Iran, counterintelligence experts ...

Nation-state actors have embedded kernel-level implants inside telecom networks designed to stay dormant for years - and 99.9 ...

Add Yahoo as a preferred source to see more of our stories on Google. Chris Hayes on "All In" (Photo credit: MS NOW/YouTube) Chris Hayes laid into Donald Trump after the president suggested the U.S.