The US backed campaign by Saudi Arabia and its allies, mainly Gulf Arab countries, is aimed at crushing the rebels, known as Houthis, who have taken over Sanaa and areas in northern Yemen and have been pressing an offensive to expand their gains in the rest of the country, including the southern port city of Aden.
The ground fighting and the airstrikes have pushed Yemen, the Arab world's poorest country, to the brink of collapse. The fighting has also taken on the appearance of a proxy war between Iran, the Shiite powerhouse backing the Houthis, and Sunni-dominated Saudi Arabia.
In Sanaa, death toll from of bombings Monday targeting rebel depots and weapon caches in the Fag Atan mountains overlooking the city rose to 38, medical officials said. The bombings flattened houses and sent villagers fleeing for their lives.
The rebel-controlled Interior Ministry said 84 people were killed across the country in Monday's airstrikes. The casualty figures could not be independently confirmed. All officials spoke on condition of anonymity because they were not authorized to speak to the media.
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In remarks today, Iranian President Hassan Rouhani said he airstrikes in Yemen were prompted by the Sunni kingdom's failures elsewhere, causing what he called a "mental imbalance."
Speaking to reporters before heading to Indonesia, Rouhani mocked Saudi Arabia by calling it a country with dashed dreams in Iraq, Syria and Lebanon.
The remarks came a day after US Navy said aircraft carrier USS Theodore Roosevelt was steaming toward the waters off Yemen to beef up security and join other American ships that are prepared to intercept any Iranian vessels carrying weapons to the Houthi rebels.