The explosion occurred near the regional department of the Emergency Situations Ministry.
In Vladikavkaz, capital of Russia's North Ossetia, another bomb exploded early this morning causing damage to a communications-transmission tower.
Both regions are near Chechnya, where Russian forces have been battling militants.
(AP, ITAR-TASS)
The Chechnya Conflict
The aftermath of a December 2002 Chechen resistance attack on the main government building in Grozny (epa)
CHRONOLOGY
The fighting in Chechnya has raged, with short breaks, since 1994. It has brought misery, death, and destruction to the North Caucasus republic and to Russia as a whole. View an annotated timeline of the conflict.