Two police officers were killed when a suicide bomber attacked a police station in Russia’s North Caucasus region of Ingushetia.
A car bomb exploded near the station a short time later, but local media says no-one was injured in the second blast.
A spate of suicide attacks across Russia has killed about 50 people over the past week.
Russia has sought to tighten security and boost efforts to hunt down insurgents since a pair of suicide bombers attacked the Moscow metro last week, killing 40 people.
Ingushetia is a predominantly Muslim region of Russia’s North Caucasus which neighbours war-torn Chechnya and has been troubled in recent years by a violent Islamist insurgency.
In recent months, Russia has increased security as it battles a growing Islamist insurgency in the Northern Caucasus region.