The Islamic State (IS) terrorist group has claimed responsibility for an April 4 attack in the southern Russian city of Astrakhan that left two traffic-police officers dead.
A website associated with IS posted the claim on April 6, citing an unnamed IS "security source."
Earlier on April 6, Russian authorities said National Guard troops killed four men suspected of involvement in the earlier attack in a shoot-out in Astrakhan the same day.
Three National Guard officers were injured, one of them seriously.
The IS statement also claimed responsibility for this incident, calling it an "attack."
The claim comes when Russia is on high alert following an April 3 bombing in the St. Petersburg subway that left 14 people dead and nearly 50 injured.