A suicide bomber has blown himself up in the Chechen capital Grozny, also killing five police officers and wounding at least 12 other people, reports GHN based on BBC.
The attack took place outside a hall where a concert marking Grozny's City Day was about to take place.
An interior ministry statement said police were searching a "suspicious" young man when he detonated a device.
Grozny was ravaged by two wars between Russia and Chechen separatists but has been relatively calm in recent years.
The Russian statement said that police officers on duty at the event "noticed a suspicious young man near metal detectors set up at the concert hall".
"When the police decided to search him and establish his identity, the man blew himself up," it said.
The bomber was identified as 19-year-old Opti Mudarov, a resident of Grozny.
The ministry said he had disappeared two months ago and had had no contact with his family since then.
There has been no information about any civilian casualties.