The Moscow city police authority said the turnout at Saturday's opposition rally on the Russian capital's Trubnaya Square was changing all the time and at times reached 600.
"Permanent rotation of participants was in evidence at the so-called voting in the form of a rally," a spokesman for the authority told Interfax.
"About 250 journalists and bloggers were covering the event. No violations of public order were recorded," he said.
At the same time, rally organizers said more than 1,000 people were able to go through verification procedures during the rally for voting in elections for the opposition's planned Coordination Council.
More than 1,000 people gathered in a park on Tsvetnoi Boulevard in Moscow on Saturday in support for the elections, Left Front leader Sergei Udaltsov said.
Some of the demonstrators carried banners in support for elections to the Opposition Coordination Council and those arrested under criminal cases dealing with clashes between protesters and police during a May 6 rally on Bolotnaya Square in Moscow and alleged ongoing preparations for new mass disturbances, Udaltsov added.
Voting was blocked on Saturday morning by hacker attacks on the Central Voting Committee's website, but resumed by evening.
Despite this incident, some opposition activists described the elections as successful.
"I believe that the elections are being successful. If there weren't any queues for verification, the elections could be called unsuccessful," Boris Nemtsov, one of Russia's opposition leaders, who is a co-chairman of the People's Freedom Party (PARNAS), told a rally on Moscow's Trubnaya Square.
He added that 8,000 people had cast their votes before the attacks, whose target was the site of the Central Voting Committee - www.cvk2012.org.
After the distributed denial-of-service (DDoS) attacks online elections for the Coordination Council of Russia's opposition resumed, Head of the Central Voting Committee Leonid Volkov said.
He also added that the hackers had been able to block the server "that forms ballots and distributes them to voting floors."
"This means an attack not on voting floors but on the balloting server. In other words, all the floors are out of operation simultaneously," he said.
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