The Investigative Committee of Russia made this known on Saturday on its Telegram channel.

Earlier, some gunmen attacked the concert hall, killing at least 60 people and wounding 100 more, Russian security services say.

According to BBC-verified video, at least four attackers clad in camouflage gear took part in the attack, in the north-west suburb of Krasnogorsk.

The gunmen burst the Crocus City Hall while it was about to host a rock concert with parts of the building engulfed by fire and part of the roof collapsed.

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.

This event happened on a Red Wings flight shortly after it departed Moscow’s Domodedovo airport for Simferopol on Thursday. Eyewitnesses state that one of the passengers “went mad” and caused a lot of trouble on board.

The trouble maker was identified by passengers as a man in his early thirties. The uproar started when this man started to badmouth members of the crew, claiming the pilots had fallen asleep. He repeatedly shouted that Everyone “will die”. He also went on to attempt strangling a female passenger and beat up another passenger with a phone.

All of this escalated into a brawl and he was eventually subdued and tied to his seat. These events happened within 20 minutes of takeoff. At this point, the crew decided that it was best if the plan returned to Moscow.

The events took an unattractive turn as the trouble maker was severely injured during the brawl. He was rushed to the hospital. But he sadly died before he got there.