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

Newly released FBI documents reveal a plot to assassinate Queen Elizabeth II during her 1983 visit to the US, with a man claiming he would drop an object off the Golden Gate Bridge or attempt to kill her at Yosemite National Park. The files also show the FBI's hypervigilance at possible threats to the British monarch during her visits to the US, particularly due to concerns about the Irish Republican Army (IRA) and its sympathizers. The Queen's cousin, Louis Mountbatten, was assassinated by the Provisional IRA in 1979.