Iranians head to the polls to replace president killed in helicopter crash

Voters face a choice between hard-line candidates and a little-known politician who belongs to Iran's reformist movement that seeks to change its Shiite theocracy from within. As has been the case since the 1979 Islamic Revolution, women and those calling for radical change have been barred from the ballot while the vote itself will have no oversight from internationally recognized monitors.

The voting comes as wider tensions have gripped the Middle East over the Israel-Hamas war in the Gaza Strip. In April, Iran launched its first-ever direct attack on Israel over the war in Gaza, while militia groups that Tehran arms in the region – such as the Lebanese Hezbollah and Yemen's Houthi rebels – are engaged in the fighting and have escalated their attacks.