FBI uncovers 1983 plot to assassinate Queen Elizabeth II during US visit.

An FBI file relating to Queen Elizabeth II's visit to the US in 1983 has revealed a potential plot to assassinate her, with a man claiming he would attempt to harm her by dropping an object off the Golden Gate Bridge or killing her when she visited Yosemite national park. The file also reveals concerns that Irish groups were planning to protest at the monarch's attendance at a baseball game and a White House event during her state visit to the US in 1991. The FBI was aware of the possibility of threats against the British monarchy from the IRA.