Five people including three police officers were killed in a blast in Russia's North Caucasus republic of Chechnya Sunday evening, news agencies reported.
A suicide bomber set off an explosive device when approaching police officers working outside a theater and concert hall in Leninsky district of Grozny, the regional capital, after 17:00 p.m. Moscow time (1300 GMT), Xinhua reported.
One civilian also died in the blast. The number of wounded were currently unclear.
The scene has been cordoned off where investigators were working.
The Kremlin in April formally ended an anti-terrorist operation in Chechnya, which has experienced two bloody separatist wars in the past 15 years.
The North Caucasus republics of Chechnya, Ingushetia and Dagestan have seen a rise in daily violence in recent months.