Suspect shouts 'this country was built on the blood of slaves' as he is detained; neither the monarch nor his wife, Camilla, was hit

British monarchy rules dictate that 'a new sovereign succeeds to the throne as soon as his or her predecessor dies,' but it may take months before Charles’s formal coronation

Charles, who has taken over increasing duties in the face of Elizabeth's poor health, automatically becomes king, although his inauguration may take months

No other British monarch has ever reached the milestone, but some acknowledge the coming end of an era; street parties, pop concerts and parades planned until Sunday