The death toll in Sunday's attack on a military unit in the southern Russian republic of Dagestan has risen to five, a law enforcement source reported, adding that 39 people were injured.
A Zhiguli car packed with explosives and driven by a suicide bomber detonated near the town of Buinaksk after ramming the gates of the military unit early on Sunday.
Another source said 34 were injured. Many of those injured were in serious condition.
Earlier the Defense Ministry said three were killed and 26 injured.
A second explosion rocked the town as investigators were heading to the site. The second bomb exploded on the way of a police car after the car passed by the place where the bomb was planted, so no one was killed or injured.
A Defense Ministry spokesman said the ministry has dispatched a special commission led by acting Southern Military District commander Maj. Gen. Alexander Galkin to the site of the terrorist attack.
An investigation is underway.
Sporadic terrorist attacks and militant clashes are common in Russia's largely Muslim North Caucasus republics, especially Dagestan, Chechnya and Ingushetia.
The Kremlin has pledged to wage "a ruthless fight" against militant groups but also acknowledged a need to tackle unemployment, organized crime, clan rivalry and corruption as causes of the ongoing violence in the region.
Eleven years ago, in September 1999, terrorists used a truck packed with explosives to blow up a residential building in Buinaksk killing 64 people. In a few days two residential buildings in the cities of Moscow and Volgodonsk were blown up killing over 200 people.
MAKHACHKALA, September 5 (RIA Novosti)