Iran's Foreign Minister Ali-Akbar Salehi condemned the Friday blast in the Norwegian capital of Oslo, IRNA reported.
In his message to his Norwegian counterpart Jonas Gahr Støre, Salehi condoled the minister on the blast which claimed lives of scores of Norwegian citizens.
He also expressed sympathy with the bereaved families of the victims of the incident.
In the message, the Iranian foreign minister further condoled the Norwegian government and nation on the tragic incident.
At least 84 people were killed in a shooting attack Friday on a youth camp near Oslo, organized by the Norwegian Labour Party - shortly after a massive bomb blast hit central Oslo.
A 32-year-old Norwegian man was suspected of the shootings and also for a bomb explosion in central Oslo that claimed seven lives the same day, Oslo deputy police chief Roger Andresen said.