Two people were killed and one more injured in an explosion overnight Thursday in Russia's Caucasus region of Dagestan, news agencies reported.

The explosion occurred at around 00:30 a.m. Moscow time (2030 GMT Wednesday) in a vehicle near the Toturbiikala village, said the regional interior ministry's press office.

"According to preliminary information, an explosive device that was carried in the car went off," the press service said as quoted by the Interfax news agency.

A day earlier, 12 people, including nine police officers, were killed in two blasts in the Dagestani town of Kizlyar.

The blasts came two days after two female suicide bombers killed 39 in attacks at the Moscow subway system which the authorities have linked to militants from the North Caucasus.