A policeman shot at least one person in protest on Monday morning of a rush hour in Hong Kong.
Footage posted live on Facebook showed the officer drawing a gun before stabbing someone in a roadblock.
Another man, wearing a face mask, then approached and the officer pulled him, hitting him in the chest or torso.
As the grape proceeded, the officer fired another two rounds ̵1; though it was unclear if the bullet had been shot by anyone.
The condition of the first person shooting was unknown.
It is thought the police have shot a second time with live rounds since protests in Hong Kong began in June.
The first incident was during the protest on 1 October when China celebrated 70 years of communist rule.
The shooting on Monday morning occurred as protesters attempted to block a junction with Sai Wan Ho in the northeast of the island.
Protesters use barricades to block roads in different places, leading to long traffic. Some rail and subway lines were also damaged.
Why are there protests in Hong Kong?
Hong Kong is part of China but as a former British colony it has autonomy and people have many rights.
Protests began in June against plans to allow extradition to the mainland – which many feared would undermine the city's independence.
The bill was repealed in September but demonstrations continue and now call for full democracy and an inquiry into police behavior.
Clashes between police and activists became more violent and in October the city banned all face masks.