"About 4 thousand people gathered on Pushkin Square in Moscow for an unauthorized event," the message says.
Earlier, the Ministry of Internal Affairs of Russia said that every fact of provocative actions during illegal actions will be investigated.
In addition, the Investigative Committee opened a criminal case on the dissemination of calls on minors to participate in illegal rallies on January 23 on social networks.
Also, a criminal case was opened in the Novosibirsk region.