TEHRAN, March 1 (Xinhua) -- Iran confirmed early Sunday that its Supreme Leader Ali Khamenei was killed in U.S.-Israeli airstrikes here the previous day.

"Iran's leader attained martyrdom while carrying out his duties at his office," reported Iran's Nour News affiliated with the country's Supreme National Security Council.

Following the announcement of Khamenei's death, Iranian mourners took to the streets across various cities on Sunday, voicing their anger and calling for retribution.