In response, police used tear gas, rubber bullets and water cannon to disperse crowds, and fired live warning shots as they tried to clear the streets.
The latest protests came just a day after the arrest of several key pro-democracy activists and lawmakers in China's special administrative region.
The latest protests came just a day after the arrest of several key pro-democracy activists and lawmakers in China's special administrative region.
Hong Kong has now seen 13 successive weeks of demonstrations.
The movement grew out of rallies against a controversial extradition bill - now suspended - which would have allowed criminal suspects to be sent to mainland China for trial.
Police said in a tweet they had responded at both sites after reports of "radical protesters" assaulting citizens and damaging property.
Police said in a tweet they had responded at both sites after reports of "radical protesters" assaulting citizens and damaging property.
In a statement, Hong Kong's government also said some protesters had "committed arson and "hurled miscellaneous objects and iron railings" on to railway tracks, "completely disregarding the safety of other passengers.
Criminals undermine life and can't be considered Democracy seeker. Just a thought.
Criminals undermine life and can't be considered Democracy seeker. Just a thought.