A suicide bomber set off a car-bomb blast that killed at least two police officers and injured seven others on Thursday in North Caucasus, a Dagestan province police spokesman said.
The bomber detonated the explosives after police stopped his car at a checkpoint about 100 km (60 miles) north of Dagestan's capital, Makhachkala, the spokesman said.
The blast came a month after twin bombings blamed on female suicide attackers from Dagestan killed 40 people on Moscow's metro on March 29.
The Moscow bombings were followed by several deadly attacks in the North Caucasus, including two suicide blasts that killed 12 people, mostly police, in Dagestan on March 31.
ReutersLast Mod: 29 Nisan 2010, 19:03