Iran has blamed the US and Israel for the strike; the US is looking into reports of the incident, while the IDF says it is "not aware" of operations in the area.

Iran responds by launching missiles and drones towards Israel and four Gulf Arab countries that host US military bases.

The killing of the supreme leader will be a huge jolt to the Islamic Republic, which will try hard to show it has a plan in place.

World leaders are responding to the attacks on several Iranian cities and Tehran's retaliation.