The Governor of Missouri has issued a statement following nights of violence after the shooting of an unarmed teenager in Ferguson.
Jay Nixon said the death of Michael Brown had "ripped open old wounds that have festered for generations".
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The helicopter, which the royal was not in at the time, avoided a potentially deadly mid-air crash.
The shots on a bus sparked a major security scare as weekend tourists in some of the world's most famous casinos were told to bunker down.
The Ukip leader confirmed he had "no prior warning" of Douglas Carswell's resignation from the party as he hit out at the "staunch Tory".