The Hong Kong police fired rubber bullets and tear gas at the protesters in Hong Kong where anger at a new extradition bill has now turned into violence.
Protesters blocked key roads around government buildings and threw bricks and projectiles at police.
The government is still backing the bill, which would allow extradition to mainland China and it is expected to pass its final vote on 20 June.
But the Legislative Council (LegCo) has now delayed its second reading.
The pro-Beijing LegCo said Wednesday's scheduled meeting would instead be held at an unspecified "later time".
22 people have been wounded so far in clashes but none are said to be critical.