An anti-G8 protester was wrestled to the ground by police officers after appearing to try and jump off a building in central London.
The start of this video has no sound.
Thirty-two people have been arrested during the demonstrations in the capital ahead of next week's G8 summit in Northern Ireland.
More top news
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".