One of the gunmen was identified, the report said, adding that he was linked to several murders. There was no immediate evidence of their links to Islamist extremists.
However, groups with close links to Islamic State militants in Syria and Iraq remain active in Chechnya and other regions in the North Caucasus.
Russian forces and Islamist insurgents seeking to establish an independent emirate have fought for control of the Caucasus region for more than two decades.
In recent years, the violence has increasingly spread from Chechnya to the adjacent provinces of Dagestan, Ingushetia and Ossetia, which like Chechnya are home to various mainly Muslim ethnic groups.
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However, groups with close links to Islamic State militants in Syria and Iraq remain active in Chechnya and other regions in the North Caucasus.
Russian forces and Islamist insurgents seeking to establish an independent emirate have fought for control of the Caucasus region for more than two decades.
In recent years, the violence has increasingly spread from Chechnya to the adjacent provinces of Dagestan, Ingushetia and Ossetia, which like Chechnya are home to various mainly Muslim ethnic groups.
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