Kremlin critic Alexei Navalny’s supporters had their homes and offices raided Thursday by Russian law enforcement just days after President Vladimir Putin Vladimir Vladimirovich PutinWatchdog confirms State Dept. canceled award for journalist who criticized Trump Former intelligence agency director Robert Cardillo speaks out against 'erratic' Trump Kremlin: Putin calls for reset between US and Russia on cyber relations before elections MORE's ruling United Russia Party lost a third of its seats in the Moscow assembly, according to reports.

The operation involved more than 1,000 officers, 200 individual raids, and at least 39 towns and cities, The Guardian reports. The raids appear to be connected to Navalny’s money laundering charges, which he has repeatedly said are politically motivated.

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Navalny spokeswoman Kira Yarmysh told The Guardian the raids are “an act of intimidation and robbery” following the local and regional elections.

The opposition leader said in an online video that “it’s clear that only Putin himself could give the order for such a large-scale operation.”

"Putin is very angry and is stamping his feet," Navalny said, according to Reuters. “I congratulate you. Today the biggest police operation is modern Russian history is taking place.”

“This is a case where the actions of the police are no different from those of burglars,” he added.

Russia’s Investigative Committee alleges Navalny’s anti-corruption organization laundered 1 billion roubles, about $15 million dollars, from 2016 to 2018, according to The Guardian.

Navalny was jailed for 30 days earlier this year after calling for demonstrations against the exclusion of opposition candidates from citywide elections in Moscow.