January 23, 2017 0243 GMT
His remarks came after scores of innocent people were killed in a deadly terrorist attack in Afghanistan on Saturday. Daesh terrorist group claimed responsibility for the attack.
In a twitter message posted online on Sunday, Zarif said that Afghanistan terror bombings are another instance of depth of Daesh depravity, IRNA reported.
Iranian Foreign Ministry spokesman Bahram Qassemi also condemned the attack in Afghanistan’s capital, Kabul.
Terrorism, extremism, and endangering innocent people’s lives are and have always been a terrible and unexplainable act, said Qassemi.
“As we have always said that uprooting terrorism is not possible without cooperation and mutual understanding among all the world’s countries,” he added.
Kabul was plunged into mourning Sunday after its deadliest attack for 15 years killed 80 people, AFP reported.
Tempers were frayed a day after the twin bombings that tore through crowds of Shia Hazara protesters, as many anxiously searched hospitals and morgues, looking among the mutilated bodies for missing relatives.
"I promise you that I will avenge the blood of our loved ones on the perpetrators of this crime, wherever they are," President Ashraf Ghani said, declaring Sunday a national day of mourning.
The bombings occurred as thousands of Hazara protesters had gathered to demand that a multimillion-dollar power line pass through their electricity-starved province of Bamiyan, one of the most deprived areas of Afghanistan.
Many protesters defiantly camped there overnight, holding candlelight vigils and reciting Qur’anic verses even though the government announced a 10-day ban on public gatherings on security grounds.
"The lines of Afghan men and women who queued to donate blood for their injured compatriots was a poignant indicator of the Afghan peoples' resilience and solidarity in the face of terrible violence," the United Nations said.