Kiev, Caracas, Istanbul... London? It is difficult to predict when or how a protest may turn into a riot, so the best policy is to be prepared for anything.

The BBC runs public order awareness courses through its College of Journalism, and in this video Mal Geer, who runs the course, explains some of the basics between hurling abuse and tennis balls at trainees. Still, it is better to practice dodging tennis balls with a camera on your shoulder than figuring out the best plan of action when it's a brick.

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