This prophecy discusses the rise of the worst riots in history which will primarily be race riots at heart, but will also stem from more pressing issues such as economic hardships faced by people in the inner city. David Wilkerson's prophecy "The Vision" discusses how this will result in city, state, and national level declarations of Martial Law in America intended to curb the violence. But these declarations will be of little effect. Since these riots will not settle down for quite some time, martial law will remain in effect for a very long time.
From what I've seen this doesn't speak of an escalation of or increase in the number of existing riots so much as one major triggering event that sets off a massive worldwide riot in every nation on the planet and in most major cities, if not all of them, and it'll happen all at the same time, even though there will be scattered lesser riots beforehand. Washington, DC is one of the cities specifically named in this prophecy, along with New York, Chicago, LA, Seattle and several others. No international cities have been specifically identified that I'm aware of at this time.
Edit (2021-01-14): This prophecy is far enough along to safely call it fulfilled given everything that has happened in the last year.
(*Do you have a better description, or did you find an error? Please let me know.