Two suicide bombings on Wednesday morning left at least 12 people dead and 18 others wounded in Russia's Southern Republic of Dagestan.
The bombings took place near a school and police headquarters in the town of Kizlyar, near the border with Chechniya.
In televised remarks, Interior Minister Rashid Nurgaliyev said when police pulled over a suspicious-looking car, the driver detonated explosives.
Then, as police officers and residents gathered at the scene, there was a second blast - this one set off by a bomber wearing a police uniform.
Among the dead were the town's police chief and another officer.
Interior Minister Rashid Nurgaliyev later called for increased security in public areas such as theaters, schools and universities, The New York Times reported.
"These attacks show that terrorists can target anywhere," he said.
The incident come just two days after two female suicide bombers killed 39 commuters in the Moscow subway system on Monday.
So far, no group has claimed responsibility for Wednesday's attacks.