Two explosions killed nearly 100 people and wounded scores at a ceremony in Iran on Wednesday to commemorate commander Qassem Soleimani who was killed in 2020, Iranian officials said, blaming unspecified “terrorists”, writes Reuters.

Iranian state television reported a first and then a second blast after 20 minutes during a crowded fourth-anniversary event at the cemetery where Soleimani is buried in the southeastern city of Kerman.

No one claimed responsibility for the blasts. A senior Biden administration official said in Washington that the blasts appeared to represent “a terrorist attack” of the type carried out in the past by Islamic State militants.

Iranian President Ebrahim Raisi condemned the “heinous and inhumane crime”, and Iran’s top authority Supreme Leader Ayatollah Khamenei vowed revenge for the bloody twin bombings.

“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.

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.