On Monday, three people were killed in a shooting attack in the Chechen capital of Grozny, according to reports of state-run news agencies.
They added that further information is being clarified.
"The shootout began when unnamed armed militants attacked law enforcement officers on Putin Avenue in central Grozny," anonymous witnesses said.
They added that two law enforcement officers were killed and at least one of the attackers has been shot dead, with reports saying a second attacker was either wounded or killed.
Law enforcement officers are investigating the incident.
Grozny, which was devastated by mass bombings during the first and second Chechen wars in the 1990s, has been largely rebuilt in recent years with major investments in infrastructure. The region continues to grapple with the threat of terrorist attacks.