Newly-released FBI files reveal a possible plot to assassinate the United Kingdom’s Queen Elizabeth II while she was visiting California in 1983.

One document recounts a tip San Francisco police gathered approximately a month before that visit relating to a phone call from “a man who claimed that his daughter had been killed in Northern Ireland by a rubber bullet.”

“This man additionally claimed that he was going to attempt to harm Queen Elizabeth and would do this either by dropping some object off the Golden Gate Bridge onto the Royal Yacht Britannia when it sails underneath, or would attempt to kill Queen Elizabeth when she visited Yosemite National Park,” the document read.

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