A suicide bomber killed two police officers and wounded several more on Friday when he blew himself up near the interior ministry headquarters in the Chechen capital Grozny, Russian news agencies reported.
The Interfax news agency quoted an interior ministry source as saying that two unknown individuals had tried to cross a security post in front of the building.
"The police prevented them from doing so. At that moment one of the criminals went up to the policeman, put his arms round him, and then blew himself up," the source said.
"Two police were killed and several others have been wounded," the source added.
Russia in April ended its decade-long "counter-terrorist operation" in its southern region of Chechnya, claiming stability had returned to a territory torn apart by two wars since the collapse of communism.
Analysts warned at the time that predominantly Muslim Chechnya still faced problems from militancy and low-level insurgencies were still continuing in neighbouring regions of Ingushetia and Dagestan.