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At least 12 people, including a top local police official, have been killed by two suicide bombings in Russia's North Caucasus republic of Dagestan. A car bomb was detonated at about 0830 (0430 GMT) outside the offices of the local interior ministry and the FSB security agency in the town of Kizlyar, BBC reported.

Another bomber then blew himself up 20 minutes later as a crowd gathered. In Wednesday's attacks, the first suicide bomber detonated his explosives when police tried to stop his car as he drove into the centre of Kizlyar.

As police, emergency services personnel and residents gathered at the scene, a suicide bomber wearing a police uniform approached and blew himself up, killing among others the town's chief of police.

A total of nine police officers were among the dead, the investigative committee of Russian prosecutors said in a statement. Twenty-three people were injured.

Russia is on alert after double suicide bombings on the Moscow Metro on Monday morning, which left 39 people dead.