U.S. federal authorities have issued a warning to law enforcement agencies in California about a potential retaliatory attack linked to rising tensions between Iran and the United States.

According to reports, the Federal Bureau of Investigation distributed a security bulletin suggesting that Iran could attempt a “surprise” drone strike on locations along the U.S. West Coast. The alert indicated the drones might be launched from a vessel positioned offshore in the Pacific Ocean.

The memo reportedly warned that such an attack could occur as retaliation for recent U.S. and Israeli military actions against Iran. However, officials emphasized that the information was precautionary and not based on confirmed operational plans.

Authorities also noted that the intelligence bulletin did not identify specific targets, timing, or methods, and investigators have not confirmed a credible or imminent threat.

State and local agencies across California—including police departments in major cities—have been notified and are coordinating closely with federal authorities while monitoring the situation.

Despite the alarming nature of the warning, officials have urged the public not to panic. Leaders including California Governor Gavin Newsom said security agencies are on heightened alert but there is no immediate danger to residents.

Experts say the alert highlights how global conflicts can raise concerns about potential retaliatory actions far beyond the battlefield. Still, intelligence agencies stress that many such warnings are issued out of caution rather than certainty.

For now, authorities say they will continue to track developments while ensuring security measures remain in place across key locations in the state.