A suicide attacker has killed at least two police officers in the Russian republic of Ingushetia.
It's the latest in a series of such bombings.
Shortly after the first attack, a car bomb was detonated in the same place in the town of Karabulak, about 20 kilometres, from the regional capital Magas but no-one was hurt in the explosion, officials told the BBC.
Forty people died in two attacks on Moscow's Metro system last week, and another North Caucasus republic, Dagestan, has also been targeted.
The Kremlin blamed Islamists from the North Caucasus for the earlier attacks.
Russian media have published images of a 17-year-old girl they say carried out one of the attacks in Moscow, saying she was from Dagestan and the widow of a militant.