The incident in the district of Mosa Qala killed five women, four men and a child, Khaama Press reported.
Seven other people were wounded.
All of the victims were riding in a civilian vehicle, district security chief Haji Amir Mohammad said. A similar incident in the same district last week killed 11 civilians and wounded several others.
No one has yet claimed responsibility for Thursday's blast.
Wisconsin business offering 'therapeutic cuddling' forced to close
Costly malfunction causes beer flood at Boston-area brewery