The Federal Bureau of Investigation (FBI) warned law enforcement agencies across California at the end of February 2026 that Iran had allegedly aspired to launch a surprise drone attack on targets in the state in retaliation for any United States military strikes against the Islamic Republic. The confidential alert, distributed through the multi-agency Los Angeles Joint Regional Intelligence Center, became public on 11 March 2026 through reporting by ABC News, on the twelfth day of an active military conflict between the United States, Israel, and Iran.
The FBI bulletin stated that intelligence acquired as of early February 2026 suggested Iran was considering a surprise attack using unmanned aerial vehicles launched from an unidentified vessel positioned off the United States coastline, with California identified as the targeted geography. The Federal Bureau of Investigation stated explicitly that it had no additional information on the timing, method, specific targets, or perpetrators of the alleged attack. Multiple United States and California state law enforcement and intelligence officials subsequently told CBS News that the intelligence was uncorroborated and not actionable. A California-based federal law enforcement official described the bulletin as not actionable.
Why did the FBI alert California law enforcement about an alleged Iran drone threat targeting the West Coast in 2026?
The FBI bulletin was framed as a retaliatory contingency assessment tied directly to United States military operations against Iran. Intelligence suggested that Iran was considering drone strikes on California in the event that the United States launched military action against Iranian territory. That threshold was crossed on 28 February 2026, when United States and Israeli forces launched coordinated airstrikes against Iran, targeting major nuclear facilities including Fordow, Natanz, and Isfahan. Supreme Leader Ali Khamenei was killed in those strikes. Mojtaba Khamenei was officially installed as Iran’s new Supreme Leader on 8 March 2026.
Iran has a documented history of asymmetric retaliation that includes proxy warfare, cyberattacks, and the deployment of allied militant groups against United States and Israeli interests. Since the outbreak of the conflict on 28 February 2026, Iran’s Islamic Revolutionary Guard Corps has conducted missile and drone strikes against targets across the Middle East, disrupted oil shipping through the Strait of Hormuz, and facilitated Hezbollah strikes against Israeli positions in and around Beirut, Lebanon. Several United States soldiers were killed on the second day of the conflict in an attack on a military installation in Kuwait.
What has the United States Department of Homeland Security assessed about the Iran threat of attacks inside the United States?
A United States Department of Homeland Security threat assessment concluded that Iran and its proxies probably pose a threat of targeted attacks on the United States, while assessing that a large-scale physical strike on the continental United States remained unlikely. The Defense Intelligence Agency’s 2025 Worldwide Threat Assessment separately concluded that Iran had not been producing a nuclear weapon but had undertaken activities that better positioned it to pursue one if it chose to do so.
United States intelligence officials have in recent months raised concern about the growing use of drones by Mexican drug cartels, and the possibility that the technology could be used against United States law enforcement or military personnel near the United States-Mexico border. A separate FBI bulletin from September 2025, reviewed by ABC News, noted an uncorroborated report that unidentified Mexican cartel leaders had authorised potential explosive drone attacks against United States personnel along the border, describing the scenario as unprecedented but plausible.
How did California Governor Gavin Newsom and the White House respond to the FBI bulletin about an Iran drone threat?
California Governor Gavin Newsom confirmed awareness of the FBI alert at a press conference on 11 March 2026 and stated that he had activated the California state emergency operations center at the start of the conflict. The Governor’s office characterised the FBI bulletin as one of many daily security updates California receives from federal partners and confirmed that the state had elevated its security posture since hostilities began on 28 February 2026.
President Donald Trump, speaking to reporters at the White House before ABC News published the contents of the FBI bulletin on 11 March 2026, dismissed the prospect of Iranian attacks on United States soil and told reporters he was not worried. The White House did not respond to a request for comment after publication of the bulletin details. The Federal Bureau of Investigation’s Los Angeles field office also declined to comment on the bulletin.
What is the broader geopolitical and military context of the United States-Iran conflict that prompted the FBI warning?
The United States and Israeli forces launched coordinated airstrikes against Iran on 28 February 2026, striking nuclear facilities including Fordow, Natanz, and Isfahan and killing Supreme Leader Ali Khamenei. The strikes rapidly expanded into a wider regional conflict with significant consequences for global energy and equity markets. Iran’s Islamic Revolutionary Guard Corps moved to block oil shipping through the Strait of Hormuz, a critical chokepoint for global crude oil supply, driving up fossil fuel prices worldwide.
The conflict has drawn in multiple regional actors. Israel has been exchanging strikes with Iran-backed Hezbollah forces in and around Beirut, Lebanon. United States military installations across the Gulf region have also come under attack, with several United States soldiers killed in Kuwait on the second day of the conflict. Iran, operating under new Supreme Leader Mojtaba Khamenei since 8 March 2026, has continued to use drone and missile attacks as primary instruments of retaliation against United States and Israeli targets in the Middle East.
Security analysts and former United States government officials have noted that the killing of Iran’s top leadership, combined with ongoing military pressure, raises the likelihood of asymmetric and unconventional retaliatory actions by Iran or its proxies. Iran has a well-documented presence in Mexico and South America, which has drawn concern from United States counterterrorism officials about potential operational channels that could be used to facilitate attacks closer to the United States mainland.
Key takeaways: what the FBI Iran drone warning means for California, United States homeland security, and the wider conflict
- The Federal Bureau of Investigation distributed a confidential bulletin to California law enforcement agencies at the end of February 2026 warning that Iran had allegedly aspired to conduct a surprise drone attack on California targets from an unidentified offshore vessel, contingent on United States military strikes against Iran.
- The FBI explicitly stated it had no additional information on the timing, method, specific targets, or perpetrators of the alleged attack; multiple United States and California state law enforcement officials described the intelligence as uncorroborated and not actionable.
- The contingency the FBI had assessed was realised on 28 February 2026, when United States and Israeli forces launched airstrikes against Iran, killing Supreme Leader Ali Khamenei and triggering an active regional conflict now in its twelfth day.
- California Governor Gavin Newsom confirmed the state had elevated its security posture and activated its emergency operations center at the start of the conflict; President Donald Trump publicly dismissed the prospect of Iranian attacks on United States soil.
- A United States Department of Homeland Security threat assessment assessed Iran and its proxies as probably posing a threat of targeted attacks on the United States, while concluding that a large-scale physical strike on the continental United States remained unlikely.
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