"The city of Mashhad gathered in mourning on Sunday after state media confirmed the death of Supreme Leader Ayatollah Ali Khamenei, who was killed in a joint US-Israeli military operation that struck Tehran. Footage from the Imam Reza shrine shows mourners crying while waving Iranian flags and holding up pictures of their late leader. Crowds also raised the flag of mourning at the mausoleum. Iran has declared 40 days of national mourning and a seven-day public holiday following their leader's killing. US President Donald Trump also confirmed Khamenei's death in a post on Truth Social, calling it 'justice' for the Iranian and American people. "He was unable to avoid our Intelligence and Highly Sophisticated Tracking Systems and, working closely with Israel, there was not a thing he, or the other leaders that have been killed along with him, could do," Trump wrote. "This is the single greatest chance for the Iranian people to take back their Country," his statement added. "We are hearing that many of their IRGC, military, and other security and police forces no longer want to fight. [...] As I said last night, now they can have immunity, later they only get death!" Meanwhile, Iran's Revolutionary Guard called Khamenei's assassination a 'great crime,' warning that it will 'not go unpunished.' The United States and Israel launched a joint attack on Iran on Saturday, with US President Donald Trump and Israeli Prime Minister Benjamin Netanyahu vowing to 'destroy Iran's missiles'. In response, Iran's Revolutionary Guard Corps said that 'widespread missile and drone and attacks' against Israel were underway. US bases were also reportedly targeted in UAE, Bahrain, Qatar, Iraq and Kuwait. Ali Khamenei was the Supreme Leader of the Islamic Republic of Iran and the country’s highest political and religious authority. He assumed the position on June 4, 1989, following the death of the founder of the Islamic Republic, Ruhollah Khomeini."