Eight people were killed by twin blasts in Russia's North Caucasus Monday, law enforcement authorities said.

The blasts took place near the court bailiffs service headquarters in Makhachkala, capital city of the Dagestan republic, a spokesperson for Dagestan's top investigative agency told local media.

"Two cars were blown up one after another. At least eight people were killed. Report about injured victims are being verified. More than a dozen cars were damaged," he said.

According to local police, the first car bombing caused no casualties. A few minutes later when the police arrived to the site, another bomb went off, resulting in casualties.

Over 20 cars at a parking lot of the court marshals' office have been damaged, Interfax news agency quoted local police spokesperson as saying.

Preliminary investigation indicated both explosions were conducted by a remote control.

Violence is common in Dagestan as well as in other Northern Caucasus regions.