They were surrounded by hundreds of observers who stood watching the mayhem unfold , largely in silence .
A small group of rioters appeared to be at the heart of the action , fuelling the fires that littered the downtown .
rioters were surrounded by hundreds of observers who stood watching the mayhem unfold , largely in silence .
A small group of rioters appeared to be at the heart of the action , fuelling the fires that littered the downtown .