The authorities have sanctioned a march on April 25, but changed its route away from the city center, the site of unprecedented protests against President Alyaksandr Lukashenka's reelection last month.
Lukashenka himself today traveled to a region of Belarus close to the Ukrainian border contaminated by radiation released during the disaster.
Belarus lay in the immediate path of the radioactive cloud caused by the April 26, 1986 disaster in neighboring Ukraine.
(belta.by)