Two police officers were shot dead and another was wounded in an attack in the southern Russian republic of Dagestan.
The local interior ministry said gunmen opened fire on a police post in the city of Derbent. Police are searching for the attackers.
Dagestan, in the volatile North Caucasus region, has been the site of regular attacks against the security services.
Authorities in Dagestan, Ingushetia and other North Caucasus regions are battling to defeat an Islamist insurgency that has already killed scores of civilians and police.
compiled from agency reports