Violence has erupted between riot police and protestors at Hong Kong Airport, forcing the cancellation of flights for a second day.
A Wall Street Journal reporter shared the moment protestors cornered an officer, stealing his baton and forcing him to pull a firearm on the crowd.
The journalist said he was "astonished" noboby was killed.
Another video shows protestors pinning down an alleged undercover policeman and restraining him with cable ties.
Medics struggled to make their way through the crowds to help him.
Hong Kong leader Carrie Lam said the violence is pushing Hong Kong "down a path of no return".