Moscow's Tverskoi District Court has sentenced opposition leader Alexei Navalny to 7 days of administrative arrest for disobeying police during an unsanctioned gathering on downtown Moscow's Manezhnaya Square in support for the people convicted earlier on Monday to prison terms for involvement in the May 6, 2012 clashes between protesters and police.

Navalny was detained twice on Monday, the first time near Moscow's Zamoskvoretsky District Court building and later near the Okhotny Ryad metro station in central Moscow.

The Tverskoi Court also sentenced Boris Nemtsov, a co-chairman of the RPR-PARNAS party and a member of the Yaroslavl regional Legislative Assembly, to 10 days of administrative arrest for disobeying police on Manezhnaya Square on Monday.

It was reported earlier that police had detained around 420 people during the Monday events in central Moscow.

Earlier on Monday, the Zamoskvoretsky Court had found 8 people guilty of involvement in clashes with police during a previously authorized rally on Bolotnaya Square in Moscow on May 6, 2012 and sentenced them to prison terms varying from a suspended sentence to four years behind bars.

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