UN Secretary-General Antonio Guterres is saddened by the death of Iran's President Ebrahim Raisi, Foreign Minister Hossein Amir-Abdollahian and their colleagues in a helicopter accident, his chief spokesperson said on Monday.

"The Secretary-General expresses his sincere condolences to the families of the deceased and to the Government and people of the Islamic Republic of Iran," the spokesperson, Stephane Dujarric, added in a statement.