I have no idea how I came across this today, but there is an interesting and potentially valuable article on How to Survive a Riot. I have never been in one, but being in a large, international city (even a well-managed and rather safe one, relatively speaking), one can never be too prepared. The article is short and there are a few useful suggestions I found.
My main take away? If in a riot or mob, move to the side slowly so as not to attract attention to yourself (and possibly make you a target of the rioters or the police). I hope I will never need this . . .