A group of undercover Hong Kong polices sneaked into protestors frontline again on August 31, 2019. One of the polices fired gun towards the sky as a way of signal when they failed to prove themselves in front of others, 4-5 people were arrested in the video @Victoria Park, near fountain, Hong Kong.
Resource: Matt Matt
Facebook: mshmatthew/videos/10159098463993438/
LIHKG: lihkg.com/thread/1525163/page/6