The gunmen opened fire from a Lada car after police had stopped the vehicle.
"The militants were killed as the police returned fire," the source said.
No police officers were injured in the shootout. Two Kalashnikov assault rifles, a Makarov pistol, and a hand grenade were found in the car.
Russia's volatile North Caucasus region has seen a surge in militant attacks against police and civilians in recent months.
In a separate development, an explosive device containing 5.5 kg of TNT and filled with nuts and bolts to increase its destructive power was found in the village of Neitrino in the republic's Elbrus Region.
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Any anti-ISIL operation in Iraq cannot be effective unless the Islamic State is attacked in Syria. But the final statement of the Paris Conference did not mention Syria as a precaution against disunity in the coalition and with due regard for the Russian position. Professor of the Chair of Modern East Department of History, Political Science and Law in RSUH