More than 100 people killed in explosions near tomb of Iranian Guards commander Qasem Soleimani

"Cruel criminals ... must know that they will be strongly dealt with from now on and ... undoubtedly there will be a harsh response," Khamenei said in a statement, according to state media. Several countries, including Russia and Turkey, condemned the attacks, and the U.N. Secretary-General called for those responsible to be held accountable.

Iranian Health Minister Bahram Eynollahi told state TV the death toll was 95, down from 103, and said 211 others were injured, making it the deadliest attack in the history of the Islamic Republic, which has faced similar incidents in the past from various groups, including Islamic State.