A shootout occurred near the Federal Security Service (FSB) headquarters in central Moscow on Thursday, media reports say.
There are conflicting reports about the number of people killed in the incident. According to REN-TV, the death toll stands at 2, while the Izvestiya media outlet says that 3 people have been killed.
The media outlet added that the shooting started at the reception of the FSB headquarters. After that, the suspected gunmen fled to Bolshaya Lubyanka street and barricaded themselves in a nearby building.
According to Telegram channel 112, two of the three attackers were killed, while the third one continued shooting.
Footage filmed near the alleged scene of the shootout has been shared online.
A video is available showing special task forces arriving at the scene of the shooting.