Update (10:32AM ET): Authorities fired a live round near Victoria Park as a warning to protesters.
Dramatic scenes near Victoria Park as a live round was fired by police skywards as a warning shot to protesters. #hongkongprotests
Video: SCMP/Kao Shan Shan pic.twitter.com/c2RDpUgPYO
— SCMP Hong Kong (@SCMPHongKong) August 31, 2019
A video on Facebook, meanwhile, appears to show the moment protesters discover an undercover officer firing what appears to be pepper rounds.