Member of the Union of Armenians of Russia David Tonoyan said on his Facebook page that the Azerbaijanis had stabbed his friend.
He posted a video showing how police officers detain Azerbaijanis.
“The cars are checking everything. There are already detainees,” he said.
The political figure Aram Karapetyan has earlier shared a video on his Facebook, referring to the website Infoteka24.ru. In the video, several people beat a man sitting in a car, and also break the windows of the car.