Municipal and riot police forced the 60 people to Oktyabrskaya Square with their hands behind their heads.
July 7 was the sixth anniversary of the disappearance of Dmitry Zavadsky, a cameraman for Russian TV news. The previous year, two opposition leaders and a friend disappeared.
All four are suspected to have died, but no body has been found.
(AP)
RFE/RL Belarus, Ukraine, And Moldova Report
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