Security officials have carried out searches in five of opposition leader Alexei Navalny’s regional offices across Russia, days after local elections where he urged supporters to vote strategically against Kremlin-aligned incumbents.

The raids in the cities of Ufa, Samara, Perm, Chelyabinsk and Saransk took place less than a week after Navalny’s Moscow offices were raided. Moscow police had reportedly told Navalny volunteers and staffers that the raids last Friday were part of an investigation into alleged mass civil riots during July 27 anti-government protests.