A militant was killed on Monday morning in the capital of Russia's North Caucasus republic of Dagestan, a Federal Security Service (FSB) source told RIA Novosti.
"A militant was eliminated during a special operation in Makhachkala," the source said.
He also said an FSB officer was injured during the operation.
"Sappers are working at the scene," he added.
Russia's mainly Muslim North Caucasus republics, especially Chechnya, Dagestan and Ingushetia, have seen an upsurge of militant violence lately, with frequent attacks on police and officials.
The Kremlin has pledged to wage "a ruthless fight" against militant groups but has also acknowledged the need to tackle unemployment, organized crime, clan rivalry and corruption as causes of the ongoing violence in the region.
MAKHACHKALA, March 22 (RIA Novosti)