MAKHACHKALA, Russia – Several attacks in Russia’s volatile North Caucasus region have left two police officers dead and another five wounded, officials said Saturday.

The ministry’s branch in Dagestan said one officer was gunned down late Friday on the outskirts of the regional capital, Makhachkala.

Another was killed Friday in the province of Ingushetia west of Chechnya. The gunmen shot and killed him outside an auto repair shop in the region’s main city of Nazran.

In another attack Saturday in the province of Kabardino-Balkariya, a truck carrying police hit a radio-controlled land mine, injuring five officers.

The attacks follow Thursday’s suicide bombing near the central market of Vladikavkaz, the regional capital of the republic of North Ossetia, that killed 17 people and wounded more than 140. It was the most serious attack in Russia since the March subway bombings in Moscow that killed 40 people.

The ethnically diverse North Caucasus region has been plagued by violence stemming from two separatist wars in Chechnya and fueled by poverty, corruption and police abuses.