The blast occurred in the Musayi district of Kabul province, but it was not immediately clear if the explosion was caused by a newly planted bomb or an old landmine, regional police commander Gen. Zalmai Oryakhail said.
Three civilians died in the blast and a fourth died on the way to the hospital, Oryakhail said.
Militants often plant roadside bombs, but they usually target Afghan or international security forces.
Afghanistan is littered with unexploded ordnance after decades of war and strife, and landmine accidents are common.
Russia has been developing an energy module on the basis of the megawatt-class nuclear power plant since 2010. The spaceship needs neither sunlight nor solar batteries
There are legitimate authorities in Donetsk and Luhansk republics now, with which Russia can implement the project of the economic integration of the Donbass
Austria does not intend to expel Russian diplomats because of the spy scandal