Videos taken by a Global Times reporter in Beijing on Sunday showed that the Iranian national flag was flown at half-mast at the Iranian Embassy in China. Iran's Supreme Leader Ayatollah Ali Khamenei was killed in his office on Saturday morning during US-Israeli air strikes, media reported. Iran announced 40 days of mourning and vowed to revenge, warning "the most devastating offensive operation in the history of Iran's armed forces" is set to begin, according to Iranian media.