"Our initial information is eight people were martyred, and 18 others were wounded, all the victims are civilians," the Badakhshan provincial governor's spokesman Naweed Froutan told AFP, adding that the death toll is set to rise.
The district governor of Keshim, where the attack took place, gave a higher toll of at least ten killed and 30 wounded.
"It was a motorcycle bomb explosion inside a main market in Keshim district of Badakhshan province ," Abdul Salam Paiman told AFP, adding that some of the wounded were in critical condition and all had been taken to hospital.
No one has yet claimed responsibility for the blast in the remote, mountainous province.
The attacks come just days after Washington expanded the US military 's authority to carry out airstrikes on the insurgents.