The blast took place around 9:00am local time in front of Kabul Bank branch in Maimana city.
According to eye-witnesses the explosives were placed in a bicycle that went off in front of Kabul Bank branch and near a currency exchange market.
Those wounded in the blast have been transferred to Afghan-Turk hospital in Maimana, and there are no details regarding their health conditions so far.
According to sources from hospital, a woman, two children and two policemen were among the victims.
No group including the Taliban militants have claimed responsibility for the attack so far.