- Iran may be activating sleeper cells outside the country, alert says abcnews.com
- A Mysterious Code Is Being Broadcast on Shortwave Radio. Is It Iran? The Atlantic
- From Tehran to Europe: Terrorism Risks After the Killing of Iran’s Ayatollah International Centre for Counter-Terrorism – ICCT
- US intercepts encrypted message possibly linked to Iranian sleeper cells: Report Anadolu Ajansı
- Iran sends out possible ‘operational trigger’ to activate sleeper cells abroad, US officials warn New York Post
