FBI file reveals 1983 plot to kill Queen Elizabeth II during US visit

(CNN) — Britain’s Queen Elizabeth II faced a potential assassination threat 40 years ago, ahead of a trip to the United States, according to newly released documents from the Federal Bureau of Investigation.

A cache of 103 pages were posted to the FBI’s online records site, The Vault, on Tuesday. The files cover preparations for several trips the late Queen made to the US, including an official tour of the West Coast with her husband, Prince Philip, in 1983.