The FBI warned police departments in California in recent days that Iran could retaliate for American attacks by launching drones at the West Coast, according to an alert reviewed by ABC News.
"We 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 State Homeland, specifically against unspecified targets in California, in the event that the US conducted strikes against Iran," according to the alert distributed at the end of February. "We have no additional information on the timing, method, target, or perpetrators of this alleged attack."
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The warning came just as the Trump administration launched its ongoing assault against the Islamic Republic. Iran has been retaliating with drone strikes against targets throughout the Mideast.
A spokeswoman for the FBI office in LA declined to comment.
The White House did not immediately respond to a request for comment.
U.S. intelligence officials have also grown concerned in recent months about the expanding use of drones by Mexican drug cartels and the chance the technology could be used to attack American forces and personnel near the Mexican border.
"An uncorroborated report suggested that unidentified Mexican cartel leaders had authorized attacks using UAS (drones) carrying explosives against US law enforcement and US military personnel along the US-Mexico border," according to a September 2025 bulletin reviewed by ABC News. "This type of attack against US personnel or interests inside the United States would be unprecedented but exemplifies a plausible scenario, although (cartels) typically avoid actions that would result in unwanted attention or responses from US authorities."
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California Gov. Gavin Newsom's office told ABC News: "The Governor's Office of Emergency Services is actively working with state, local and federal security officials to protect our communities."
And the LA Sheriff's Department said that "in light of current global events" it is maintaining an "elevated level of readiness."
"Out of an abundance of caution, and in recognition of current religious observances, the Department has continued increased patrols around places of worship, cultural institutions, and other prominent locations throughout the County," the department said in a statement.
"We have proactively reviewed our deployment plans, enhanced coordination with our patrol stations, and ensured that additional resources are available should they be needed."
ABC News contributor John Cohen, the former head of intelligence for the Department of Homeland Security, said he is concerned about the possibility of drone warfare coming from both the Pacific and Mexico.
Iran may be activating sleeper cells outside the country, alert says
"We know Iran has an extensive presence in Mexico and South America, they have relationships, they have the drones and now they have the incentive to conduct attacks," Cohen said. "The FBI is smart for putting this warning out so that state and locals can be better able to prepare and respond to these types of threats. Information like this is critically important for law enforcement."
While the FBI's warning did not specify how or when vessels carrying attack drones could get close enough to the U.S. mainland, intelligence officials have long been concerned about equipment being pre-positioned – either on land or on ships at sea -- in the event Israel or the U.S. struck Iran.
