Violations of the law on mass protests were at issue, the police said in a statement about half an hour after taking the opposition leader away in a van following a rally for the September 8 vote.
"Free", his spokeswoman Anna Veduta tweeted after the sight of Navalny being driven away in a police van sparked fears that the opposition leader could return to jail a month after his release.
"One of the candidates for Moscow mayor was Sunday invited to the police station for a chat on violations of the law on mass demonstrations," a police spokesman told the Interfax news agency.
Veduta had previously said on Twitter that the rally in a northeastern neighbourhood of the Russian capital was attended by 5,000 to 7,000 people.
According to AFP reporters, young men in civilian clothes attempted to disrupt the rally by clipping electric cables hooked up to the stage.
Navalny, an eloquent lawyer who fearlessly mocks Putin, has been holding daily rallies, speaking in televised debates and peppering the city with posters, despite facing a five-year jail term.
Last month he was convicted of embezzlement in a disputed verdict, but in a surprise move a court postponed his sentence to allow him to run as mayor.
However another survey gave Navalny, who has vowed to force a runoff, close to 20 per cent.
Moscow election commission chief Valentin Gorbunov said Thursday the panel would consider disqualifying Navalny "if the violations exceed the norms established by the law.
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