Hong Kong police will hold an inquiry to determine whether it was appropriate for an officer to fire two warning shots during unrest in Mong Kok.
Two handgun shots were fired into the air as hundreds of people clashed with police on Monday night.
The unrest began when officials began an operation to clear out unlicensed street food stalls.
More than 90 people, mostly police officers and reporters, were injured and dozens of people were arrested.
Protesters threw bricks and bottles at police, who were using batons and pepper spray.
Despite the attempted crackdown, food stalls were operating as usual again on Tue