Last year's protests reflected popular disenchantment with established political parties, which are again seeking power.
Israel aims for regime change in Iran, but may not care as much about whether the transition is smooth.
Ali Larijani is often viewed as a pragmatist and has an important role following the killing of Khamenei.
Many residents of Tehran managed to get out of town when the U.S. and Israel attack began, but others who could not described living under bombardment.
Dubai's airport authority says it authorised a limited number of flights as hundreds of thousands remain stranded.
Iranian Foreign Minister Abbas Araghchi holds calls with China's Wang Yi amid Israeli-US attacks on Iran.
Consumers are set to pay higher prices, but US producers could benefit, analysts say.
Israeli attacks on Lebanon have killed more than 50 people. It says the strikes are a response to Hezbollah rockets.
Americans in Riyadh and other cities were advised to shelter in place immediately.
Saudi Defence Ministry says fire broke out at the embassy, but the compound sustained only 'minor' damage.