The human rights organisation Vesna said about 30 people were arrested today. They were among about 100 people who tried to assemble on Minsk's central square.
About 400 people were arrested on Saturday while participating in an unsanctioned protest against the authoritarian government of President Alexander Lukashenko, who has stifled dissent and independent media during his 23 years in power.
Before police seized her today, demonstrator Elena Gonchar said: "Belarus has been turned into a prison. What difference does it make where you sit, in a cell or at home.