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US Elevates National Alert After Strikes on Iranian Nuclear Facilities

The Department of Homeland Security issued a heightened threat advisory after the strikes, prompting the FBI to intensify surveillance of suspected Iran-backed operatives.

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A National Terrorism Advisory System bulletin issued by the Department of Homeland Security warning of a "heightened threat environment" following U.S. strikes on Iranian nuclear sites, is photographed June 23, 2025. (AP Photo/Jon Elswick)
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Overview

  • President Trump authorized airstrikes on the Fordow, Natanz and Esfahan nuclear sites on June 21 to disrupt Iran’s uranium enrichment program.
  • Iran warned through intermediaries at the G7 summit that it may activate sleeper cells within the US in retaliation for the strikes.
  • DHS issued a National Terrorism Advisory System bulletin warning of a heightened domestic threat environment; cities from New York to Los Angeles have reinforced security at religious sites and public landmarks.
  • FBI Director Kash Patel has expanded monitoring of suspected Iran-backed and Hezbollah-linked operatives on US soil to preempt potential terror plots.
  • Customs and Border Protection data indicate over 1,500 Iranian nationals were apprehended at the southern border under the Biden administration, with nearly half released into the country.