Iran's progress toward having a nuclear weapon is central to the current conflict between Israel and Iran. Before launching recent attacks against Iran's nuclear sites, Israel said it had evidence Tehran was on the brink of building a nuclear weapon.

With Donald Trump mulling whether to send in American bunker-busting bombs to deal a crushing blow to Iran’s nuclear facilities, doubts remain about just how close Iran is to creating a nuclear bomb.

After Israel launched its war against Iran vowing to take out the country’s nuclear program before it had the ability to produce weapons, fresh scrutiny has fallen on the country's own arsenal