Suicide bombers have killed 12 people with another 110 injured in two attacks on a police post on the outskirts of the capital of Russia's Dagestan region.

The footage here shows the immediate aftermath of the attacks. The first suicide bomber detonated a bomb when police stopped a vehicle to check documents. The second explosion came when fire brigades and ambulances arrived, causing additional casualties. A witness at the scene said a fire truck was reduced to charred wreckage.

The attacks were the deadliest in months, as Russian security forces try to contain an Islamist insurgency in the North Caucasus near Sochi, where Russia will host the Winter Olympics in 2014. Security forces are fighting militants whose ranks are swollen by anger at poverty, clan feuds and pervasive corruption.