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U.S. on High Alert After Strikes on Iranian Nuclear Sites

The Department of Homeland Security warned of likely pro-Iranian cyberattacks on U.S. networks

A "No war on Iran" banner is held as people attend an anti-war demonstration in Los Angeles, California, U.S., June 21, 2025. REUTERS/David Swanson/File Photo
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Overview

  • President Trump launched Operation Midnight Hammer on June 20, deploying more than 125 warplanes, submarines and surface ships to bomb the Fordow, Natanz and Esfahan facilities with bunker-buster weapons and Tomahawk missiles.
  • The DHS issued a National Terrorism Advisory System bulletin forecasting low-level cyberattacks by pro-Iranian hacktivists and potential operations by actors linked to the Iranian government.
  • The advisory cautioned that violent extremists could be prompted by an Iranian religious ruling to carry out anti-Jewish or anti-Israel attacks on U.S. soil.
  • Police departments in New York City, Washington and Los Angeles have boosted patrols and security at religious, cultural and diplomatic sites.
  • Iran’s leadership has threatened to retaliate through sleeper-cell activations or expanded cyber warfare as it evaluates its response to the damage done to its nuclear program.