Tens of thousands rallied in a large Hong Kong suburb on Sunday, driven by abiding anger at the government's handling of an extradition bill that has revived fears of China tightening its grip over the ex-British colony and dismantling its freedoms.

Millions have taken to the streets over the past month in some of the largest and most violent protests in decades over an extradition bill that would allow people to be sent to mainland China for trial in courts controlled by the Communist Party.

Police equipped with riot gear clashed with some protesters who used metal barriers and other objects to block off roads.