Wait wait wait; I just read the thing. It's much more clearly written here, in my opinion:
"Hong Kong’s Lunar New Year celebration descended into chaotic scenes as protesters and police, who fired warning shots into the air, clashed over a street market selling fish balls and other local holiday delicacies, leaving dozens injured and arrested."
"The unrest started when authorities tried to prevent unlicensed street food sellers from operating on Monday night in Mong Kok, a working-class district of the city."
These clashes started over illegal food stalls and police trying to shut them down?? What??