New Delhi, March 22 -- One after another, Israel has taken out Iran's top leaders.

First it was Supreme Leader Ayatollah Ali Khamenei, killed in the opening shots of the war. Now Ali Larijani, the secretary of Iran's Supreme National Security Council who was considered one of the most powerful figures in the country, has also been killed. As have a raft of other top-ranking military and political leaders.

With so many top leadership figures taken out, who is now running Iran? Here is a look at the country's power structure, what is known - and what is not.

Khamenei's successor

Ultimate authority in Iran rests with the country's supreme leader, who has sat at the apex of power since the creation of the Islamic Republic in 1979 after th...