The 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.
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 InfoEgypt and Saudi Arabia committed warships to support coalition operations. Somalia offered its airspace and territorial waters. Four Egyptian Navy vessels steamed toward the Gulf of Aden after operations began. Riyadh requested access to Somali airspace and waters to carry out operations. On 27 March, the Egyptian military said a squadron of Egyptian and Saudi warships took up positions at the Bab al-Mandab strait. The Saudi military threatened to destroy any ship attempting to make port.
More InfoStrikes on 26 March also hit Al Anad Air Base, a former US special operations forces facility in Lahij Governorate seized by Houthis earlier in the week. The targets reportedly included the Houthi-controlled missile base in Sanaʽa and its fuel depot. Strikes overnight also targeted Houthis in Taiz and Sa'dah. Thousands demonstrated in Sanaʽa against the intervention, which ex-president Ali Abdullah Saleh also condemned. In Taiz thousands came out supporting Hadi and Saudi Arabia.
More InfoAlong with images of brutality, ISIL presents itself as "an emotionally attractive place where people 'belong', where everyone is a 'brother' or 'sister'". The "most potent psychological pitch" of ISIL media is the promise of heavenly reward to dead jihadist fighters. Frequently posted in their media are dead jihadists' smiling faces, the ISIL 'salute' of a 'right-hand index finger pointing heavenward', and testimonies of happy widows. ISIL has also attempted to present a more "rational argument" in a series of videos hosted by the kidnapped journalist John Cantlie. In one video, various current and former US officials were quoted, such as the then US President Barack Obama and former CIA Officer Michael Scheuer.
More InfoAccording to a June 2015 Reuters report that cited "jihadist ideologues" as a source, 90% of ISIL's fighters in Iraq were Iraqi, and 70% of its fighters in Syria were Syrian. The article stated that the group had 40,000 fighters and 60,000 supporters across its two primary strongholds in Iraq and Syria. According to scholar Fawaz Gerges writing in ISIS: A History, some "30 percent of the senior figures" in ISIL's military command were former army and police officers from the disbanded Iraqi security forces, turned towards Sunni Islamism and drawn to ISIL by the US de-Ba'athification policy following the US invasion of Iraq.
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