Some 380 people were arrested in Belarus during an unsanctioned rally held in the Belarusian capital of Minsk and other cities, the Vesna human rights center said on Monday.
"Over 200 people were arrested in Minsk," Vesna said. "About 180 people were arrested in other Belarusian cities."
The activists said that several journalists were also among those arrested.
A new wave of protests swept over Minsk and other cities on Sunday.
Police in Minsk used tear gas on Sunday to break up a protest in which demonstrators clapped over an Independence Day speech by President Alexander Lukashenko.
The unusual act of dissent in the authoritarian former Soviet republic was part of the new wave of protests in which demonstrators gather in Minsk and other cities and simply clap.
The protests are organized via the internet and the Belarusian authorities closed down a number of social media sites prior to Lukashenko's speech.
Belarus has seen unprecedented economic and political turmoil in recent months, as increasingly frequent protests against the 17-year-old reign of he authoritarian Lukashenko have combined with a 36% devaluation of the national currency.
Lukashenko- who has never been elected in polls judged fair by Western observers - has jailed political opponents, including rival presidential candidates.
On Sunday, Lukashenko, dressed in a military uniform, told a crowd in Minsk that a plot was underway to bring about a "color revolution" similar to the previous revolts in other former Soviet states.
