California Warned of Potential Drone Attacks Amid Iran War

As the United States wages its most significant military campaign in the Middle East since the 2003 invasion of Iraq, an FBI alert obtained by multiple news organizations has thrust an unsettling question into public debate: Could Iranian drones reach American shores?

The answer, according to the intelligence community's own assessment, is deeply uncertain — and that ambiguity itself has become a flashpoint in a country grappling with the domestic consequences of a war that began just two weeks ago.

The Memo

In late February 2026, the FBI's Joint Terrorism Task Force distributed a bulletin to California law enforcement agencies containing a stark warning. The memo stated that the bureau had "recently acquired information that as of early February 2026, Iran allegedly aspired to conduct a surprise attack using unmanned aerial vehicles from an unidentified vessel off the coast of the United States Homeland, specifically against unspecified targets in California, in the event that the US conducted strikes against Iran" [1][2].

That condition — U.S. strikes against Iran — has since been met. On February 28, the United States and Israel launched Operation Epic Fury, a coordinated aerial campaign against Iran's nuclear infrastructure, ballistic missile sites, air defenses, and leadership targets. Nearly 900 strikes were carried out in the first 12 hours alone, killing Supreme Leader Ali Khamenei and several high-ranking officials [3][4].

The FBI memo, however, came with a significant caveat: "We have no additional information on the timing, method, target, or perpetrators of this alleged attack" [1]. The intelligence was characterized as "uncorrelated" — meaning unverified and unconfirmed by other sources [2].

Credibility Under Scrutiny

The gap between the alarming headline — an Iranian drone attack on California — and the underlying intelligence has produced a sharp divide among officials and analysts.

Multiple U.S. and state law enforcement and intelligence officials told CBS News that there is "no credible intelligence" underpinning the FBI bulletin [5]. A source with counterterrorism experience told the Los Angeles Times that the threat has "not been deemed credible at this time" and characterized the warning as purely "cautionary" [5]. One California-based federal official described the intelligence as "not actionable" [2].

The Department of Homeland Security's own threat assessment, released on February 28, offered a more measured framing. While it stated that Iran and its proxies "probably pose a persistent threat of targeted actions in the Homeland," it concluded that "a large-scale physical attack is unlikely" [6]. DHS indicated its primary short-term concern was that "Iran-aligned hacktivists will conduct low-level cyber attacks against US networks, such as website defacements and distributed denial-of-service attacks" [6].

Yet some security professionals argue the FBI was right to distribute the warning regardless of its credibility level. John Cohen, a former DHS intelligence chief, stated that Iran has "relationships, drones and incentive to conduct attacks," and praised the FBI's alert as helping law enforcement prepare for contingencies [1].

California Governor Gavin Newsom said his office was "in constant coordination with security and intelligence officials" while noting that authorities "are not aware of any imminent threats" [2]. The Governor's Office of Emergency Services described the coordination as routine activity that happens "every day" [2].

Iran's Drone Arsenal: Capability vs. Feasibility

The scenario outlined in the FBI memo — drones launched from an unidentified vessel offshore — raises critical questions about Iran's actual capabilities.

Iran has developed one of the world's most extensive drone programs, centered on the Shahed family of one-way attack drones. The Shahed-136, sometimes called "the poor man's cruise missile," has a maximum range of approximately 1,242 miles (2,000 kilometers) while carrying an 88-pound warhead [7]. Powered by a small 50-horsepower internal combustion engine, it flies at roughly 100 knots — low and slow enough to evade many air defense systems designed to track faster-moving ballistic missiles [7][8].

These drones have been battle-tested extensively. Russia has used Iranian-supplied Shahed drones against Ukraine since 2022. Iran itself deployed them in retaliatory strikes against Israel and Gulf Arab states hosting U.S. forces in the current conflict [9]. Trump administration officials told lawmakers that Iran's Shahed attack drones represent a "major challenge" and acknowledged that U.S. air defenses "will not be able to intercept them all" [8].

The vessel-launch scenario is not without precedent — Iran has demonstrated the capability to launch Shahed variants from maritime platforms. But getting a vessel carrying attack drones within striking distance of the California coast would require crossing the Pacific Ocean undetected, a logistical and operational challenge of an entirely different order than launching from the Persian Gulf region. The U.S. Navy and Coast Guard maintain extensive surveillance of approaches to the West Coast, though gaps in coverage do exist [10].

Defense analysts broadly assess that while a vessel-launched drone attack on the U.S. mainland is theoretically conceivable, it represents an extreme end of the threat spectrum — far less likely than cyberattacks, proxy operations, or attacks on U.S. assets in the Middle East, all of which are already occurring [11].

The War That Changed Everything

The FBI's warning cannot be understood outside the context of the rapidly escalating U.S.-Iran conflict.

Since Operation Epic Fury began on February 28, the United States has struck more than 5,000 targets across Iran [3]. The killing of Khamenei represented an explicit decapitation strike — the kind of operation that analysts warned could provoke the most extreme forms of retaliation.

Iran has already responded with significant force, though directed at regional targets rather than the U.S. homeland. The Islamic Revolutionary Guard Corps carried out retaliatory strikes against 27 military bases where U.S. soldiers are deployed, as well as Israeli military installations [9]. Six U.S. service members have been killed and at least 10 seriously injured [9]. Gulf states including the UAE, Qatar, Bahrain, and Kuwait have all been hit, with Iran striking both military and civilian infrastructure [9][12].

Source: FRED / U.S. Energy Information Administration

Data as of Mar 9, 2026CSV

The economic fallout has been immediate. Crude oil prices have surged from the mid-$60s per barrel in late February to nearly $95 by early March, a spike of roughly 40% in under two weeks as markets priced in the disruption to Gulf oil infrastructure and shipping [13].

California on High Alert

Regardless of the credibility of the drone-specific threat, the FBI warning has triggered tangible security responses across California.

The Los Angeles Sheriff's Department announced an "elevated level of readiness" with increased patrols around places of worship and cultural institutions [1]. The San Francisco Police Department said it is "prepared to respond to emergencies" and is actively monitoring the conflict [10]. Bay Area police departments have established direct contact with federal agencies [14].

The timing of the warning has added an additional layer of urgency: the 98th Academy Awards ceremony is scheduled for March 15 in Los Angeles, one of the highest-profile public events in the world. Security for the Oscars has been significantly bolstered, with vehicle screenings, bomb-sniffing dogs, pre-deployed SWAT teams, undercover officers and federal agents, rooftop snipers, and roughly 1,000 private security officers at and near the venue [15][16]. The LAPD is deploying additional surveillance cameras and drones in the area while working with federal partners [16].

Broader Homeland Threat Landscape

The drone scenario, however unlikely, is only one dimension of a multifaceted threat landscape that security officials are navigating.

Bruce Hoffman, the Shelby Cullom and Kathryn W. Davis Senior Fellow for Counterterrorism at the Council on Foreign Relations, warned that "the longer this war goes on, the greater the incentive for Iran to apply all forms of asymmetric warfare" [11]. Iran has a documented history of plotting attacks on U.S. soil, including the 2022 attempt to abduct journalist Masih Alinejad from Brooklyn and a 2024 armed plot against her [11].

DHS has warned that while lone offenders in the United States have not historically been motivated by Iranian issues, "the existential threat to the Iranian regime and increased U.S. or Israeli actions could prompt some U.S.-based violent extremists or hate crime perpetrators to attack targets perceived to be Jewish, pro-Israel, or linked to the U.S. government or military" [6].

On the cyber front, threats are already materializing. Palo Alto Networks' Unit 42 published a threat brief documenting escalating Iranian cyber operations against U.S. targets [17]. Iran-aligned threat actors are conducting what analysts describe as "low-to-medium sophistication disruptions," including distributed denial-of-service attacks and hack-and-leak campaigns [17].

America's Counter-Drone Gap

The FBI warning has also spotlighted long-standing concerns about the nation's readiness to defend against drone threats on the homeland.

The Department of Homeland Security launched a new office in January 2026 dedicated to rapidly procuring and deploying drone and counter-drone technologies [18]. FEMA has distributed $250 million in counter-drone grants to states hosting 2026 FIFA World Cup matches and the National Capital Region [19]. But experts say these efforts remain insufficient.

According to NORAD data, more than 600 drone incursions have occurred at U.S. military installations [20]. The Pentagon broadened counter-drone authorities in January to shore up vulnerable U.S. bases [20]. Yet few current U.S. weapons systems are equipped to counter small military-grade or commercially available drones, and the counter-drone systems that do exist have not been widely fielded [20].

Of particular concern is the potential for drone swarms — coordinated masses of unmanned systems that can overwhelm traditional defenses through sheer volume [20]. This vulnerability was highlighted during the mysterious drone sightings over New Jersey and the U.S. East Coast in late 2024, which exposed significant gaps in the nation's ability to identify and respond to unmanned aerial activity over domestic airspace.

Misinformation and Public Fear

The fog of war has extended to the information environment. Social media posts claiming that Iran released a list of U.S. target cities went viral in early March but were debunked by fact-checkers at Poynter and PolitiFact as fabricated [21]. The White House reportedly halted a federal security bulletin warning of Iran-related threats, raising questions about the administration's approach to public communication during the crisis [22].

The tension between responsible threat communication and panic-inducing speculation is evident in the California drone warning itself. The FBI distributed intelligence it considered worth sharing with law enforcement, even knowing the threat had not been deemed credible. The subsequent leak of that information to the media created a public narrative that outpaced the underlying assessment.

What Comes Next

Two weeks into Operation Epic Fury, the trajectory of the U.S.-Iran conflict remains uncertain. Iran has demonstrated willingness to strike U.S. assets and allies in the Gulf region but has not carried out any known attack on the U.S. homeland. The killing of Khamenei has created a leadership vacuum in Tehran whose implications are still unfolding.

For California and the rest of the United States, the immediate domestic security concern lies less in a dramatic drone assault from the Pacific and more in the cumulative effects of an escalating conflict — cyberattacks against critical infrastructure, potential lone-wolf incidents, and the strain on security agencies already stretched by other priorities.

The FBI's warning, whether ultimately prophetic or merely precautionary, has served one clear purpose: it has forced a public reckoning with the reality that in an era of drone warfare and asymmetric conflict, the traditional distinction between foreign battlefields and the American homeland is growing thinner.