On 4 September a Houthi OTR-21 Tochka missile hit an ammunition dump at a military base in Safer in Ma'rib Governorate killing 52 UAE, 10 Saudi and 5 Bahraini soldiers. The Safer base was being built up by coalition forces for a push against Sanaa. "It was the deadliest single attack on coalition soldiers since the start of its operation against Houthi rebels in March" Asseri said. The attacked was the highest casualty loss in the history of the UAE military. Qatar deployed 1000 troops to Yemen after the incident.
The coalition declared Yemeni airspace to be a restricted area, with King Salman declaring the RSAF to be in full control of the zone. Saudi Arabia began airstrikes, reportedly relying on US intelligence reports and surveillance images to select and hit targets, including weapons, aircraft on the ground and air defences. Al Jazeera reported that Mohammed Ali al-Houthi, a Houthi commander appointed in February as president of the Revolutionary Committee, was injured and three other Houthi commanders were killed by airstrikes in Sanaʽa.
More InfoThe US Navy provided support to the naval blockade, halting and searching vessels suspected of carrying Iranian arms to the Houthis. On 21 April, the United States announced it was deploying warships to Yemeni waters to monitor Iranian ships. The US in particular noted a convoy of Iranian vessels, which US authorities said could potentially be carrying weapons to Houthi fighters in contravention of UN sanctions. The US reported that the Iranian convoy reversed course on 23 April.
More InfoAirstrikes launched on 12 April, against the base of the 22nd Brigade of the Yemeni Republican Guard in the Taiz Governorate struck both the brigade and a nearby village inhabited by members of the Al-Akhdam minority community, killing eight civilians and injuring more than ten others. On 17 April, both the GCC coalition's spokesman called by Saudi broadcaster Al-Ehkbariya TV and a commander of the pro-Hadi rebels on the ground said airstrikes had intensified, focusing on both Sanaʽa and Taiz. One strike on the Republican Palace in Taiz killed 19 pro-Houthi gunmen.
More InfoSaudi-backed Abdrabbuh Mansur Hadi, running unopposed as the only candidate for president, won the 2012 Yemeni elections. Since August 2014, the Houthis (or Ansar Allah), a Zaidi Shia movement and militant group thought to be backed by Iran, dissatisfied with Hadi government's decisions and the new constitution, arranged mass protests which culminated into their takeover of the Yemeni government in 2015, declaring victory of the revolution and drafting a new constitution when Hadi's provisional government had already expired its term. Saudi Arabia and other countries denounced this as an unconstitutional coup d'état.
More InfoFighter jets and ground forces from Egypt, Morocco, Jordan, Sudan, the United Arab Emirates, Kuwait, Qatar, Bahrain, and Academi (formerly called Blackwater) took part in the operation. Djibouti, Eritrea, and Somalia made their airspace, territorial waters, and military bases available to the coalition. The United States provided intelligence and logistical support, including aerial refueling and search-and-rescue for downed coalition pilots. It also accelerated the sale of weapons to coalition states and continued strikes against AQAP. The US and Britain have deployed their military personnel in the command and control centre responsible for Saudi-led air strikes on Yemen, having access to lists of targets.
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