State TV broadcast an interview of journalist Roman Protasevich in which he said he called for anti-Lukashenko protests last year, a confession the opposition, UK and Germany say was "clearly under duress".
Belarus has arrested thousands of people during demonstrations that followed a disputed August 9 presidential election. Rights groups say hundreds of detainees reported being subjected to beatings and other abuse.
Belarusian students, factory workers and pensioners answered a call by exiled opposition figure Svetlana Tikhanovskaya to launch a nationwide strike this week — a fresh move to force Lukashenko to hold new elections after months of mass protests.
Belarus' Sviatlana Tsikhanouskaya says a national strike will begin Monday after President Alexander Lukashenko's government responded with force to protests against him.
Belarus has been gripped by unprecedented youth and women-led protests since President Lukashenko claimed victory in an August election.
Belarusians have been demonstrating against President Lukashenko's disputed re-election for a month, with more than 100,000 people flooding the streets of Minsk for four straight weekends.
Students have boycotted the beginning of the school year and there were also new protests at two of the large industrial plants.
Lukashenko, who turned 66 on Sunday, is struggling to contain weeks of protests and strikes since winning an August 9 election his opponents say was rigged. He denies electoral fraud and has said the protests are backed from abroad.
Lithuania has eased coronavirus restrictions to provide Belarus activists protesting against President Lukashenko's sixth re-election a place of refuge in light of violent crackdown on mass demonstrations.
Latest police action marks the return to force, albeit on a much smaller scale compared to the post-election crackdown, when nearly 7,000 people were detained, hundreds were injured and at least three protesters died.
Both senior figures in an opposition Coordination Council, Olga Kovalkova and Siarhei Dyleuski were brought to separate courts where they were each jailed for 10 days.
The European Union's foreign ministers will meet on August 27 and 28 in Berlin, and could prepare new measures against Minsk following elections results they claim were "neither free nor fair".
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