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
Wintry weather into the weekend
Jeremy Hunt could impose controversial new contracts for junior doctors by Monday, ITV News Political Editor Robert Peston has learned.
A new video has emerged online purporting to show a four-year-old British boy blowing up a car and killing three prisoners on behalf of IS.