Iranian Foreign Ministry Spokesman Bahram Qasemi described Kabul's terrorist blast as a 'criminal' and 'inhumane' action.
Qasemi sympathized with the Afghan people and government and the bereaved families of the victims of the tragic incident.
The official expressed the hope for rooting out terrorism in the region and the world through joint bilateral, regional and international cooperation.
A suicide bomb attack at a voter registration centre in the Afghan capital Kabul on Sunday has killed at least 48 people, dispatches reported.
Daesh (also known as ISIS or ISIL) has claimed responsibility for the attack.