Iran-backed Houthi rebels struck a residential area in Yemen's third-largest city, killing two teenage girls. The strike on Tuesday renewed attention to the dangers faced by civilians in Taiz.

The escalation between the Saudis and the rebels in neighboring Yemen has exposed the kingdom's challenges in intercepting the attacks in the latest front in the Iran war, while further rattling global markets.

Iran-backed Houthi rebels hit the headquarters of the Saudi state-owned oil company Aramco in an overnight strike, two regional officials said Wednesday, damaging the offices of the firm's chief executive and other top officials.