Three police officers were injured when...

The explosion occurred on Thursday afternoon in the Russian republic"s Vedensky district.

The investigation into the incident is ongoing. The source gave no details on the seriousness of the officers" injuries.

Russia"s mainly Muslim North Caucasus republics, especially Chechnya, Dagestan and Ingushetia, have seen an upsurge of militant violence lately, with frequent attacks on police and officials.

The Kremlin has pledged to wage "a ruthless fight" against militant groups but has also acknowledged the need to tackle unemployment, organized crime, clan rivalry and corruption as causes of the ongoing violence in the region.

MOSCOW, March 26 (RIA Novosti)