Navalny, 43, has been jailed repeatedly in recent years for organizing or participating in unsanctioned protests.

His organization, Foundation for Fighting Corruption, has produced reports alleging corruption at the highest levels of government, including Prime Minister Dmitry Medvedev.

Officers of the federal court bailiffs’ service took Navalny from his office after forcing their way in. They later said Navalny hadn’t been detained.

Navalny told reporters the raid was “part of the coordinated campaign against the anti-corruption foundation.”

“This complicates our work, but we will not halt it,” he said.

Lyubov Sobol, an attorney with Navalny’s foundation, said the officers claimed to be searching for evidence connected to a case against the foundation’s director, Ivan Zhdanov.

A criminal case was opened against Zhdanov in August for failing to follow an order to remove a 2017 video report claiming corruption by Medvedev, AFP reported. The video has racked nearly 33 million views on YouTube.