Tariq Arian, a spokesperson for the Ministry of Interior (MoI), said a roadside bomb planted by Taliban militants went off in Pul-e Khumri city late on Friday.
The statement further added that the incident took place in Bagh-e Shamal area of Pul-e Khumri city, the provincial capital of Baghlan province.
The explosion killed four civilians after their vehicle struck the bomb and wounded another civilian, Arian added.
The Taliban group has not commented regarding the incident so far.