The Yemeni government launches campaigns in three provinces to battle Al-Qaeda fighters.
Around 40 people are killed by an American cruise missile strike targeting al-Qaeda-linked militants at a Huras al-Din base in Syria's rebel-held Idlib Governorate, where the Syrian government earlier began a unilateral ceasefire.
Yemen-based Houthi forces launch drone strikes on Jizan Regional Airport and Abha International Airport in Saudi Arabia. A Saudi Arabian-led coalition spokesperson says a Houthi drone has been shot down near the Saudi city of Abha.
Houthi forces launch rockets that hit and reportedly destroy HSV-2 "Swift", a military vessel belonging to the United Arab Emirates Navy, off the coast of Yemen, near the strategic Red Sea port of Mokha.
The Syrian Observatory for Human Rights reports Russian airstrikes kill at least 18 civilians and wound dozens more in the town of Ariha in Syria's northwestern Idlib province. Idlib is controlled by the Army of Conquest, a rebel alliance of mainly Islamist groups, including al-Qaeda affiliate al-Nusra Front.
A hotel where Vice President of Yemen and Prime Minister Khaled Bahah was staying in Aden which was also being used as a de facto military base by Arab coalition forces is hit by multiple explosions killing at least 15 coalition soldiers. Although the Houthis were first suspected and accused of being behind the attack, the Islamic State of Iraq and the Levant has since claimed responsibility, marking the first attack on Arab coalition forces in Yemen by the extremist group.