Thousands of people in central Iran’s Yasuj city joined the start of the mourning period for Supreme Leader Ayatollah Ali Khamenei, a video posted by Iran’s Tasnim news agency showed.

The footage showed mourners beating their heads and chests, a traditional practice in Iran during mourning.

Similar scenes were reported in Lorestan province, according to the Tehran Times newspaper.

Iran’s Supreme Leader Ayatollah Ali Khamenei and senior security officials have been killed amid ongoing US and Israeli strikes.

The Iranian Revolutionary Guard Corps has vowed revenge, claiming it has launched attacks on 27 bases hosting US forces in the Middle East, as well as Israeli military sites in Tel Aviv. Explosions have also been reported in Qatar and the UAE.

US President Donald Trump warned that Iran would face “a force that has never been seen before” if it strikes “very hard today.”

Iran’s government said an interim council, led by President Masoud Pezeshkian, will manage the country until a new supreme leader is chosen. State media reported that at least 201 people have died in attacks across 24 provinces.

Iran’s retaliatory strikes have targeted Israeli and US positions in several Middle Eastern countries, including Qatar, the UAE, Kuwait, Bahrain, Jordan, Saudi Arabia, and Iraq.