The Yemeni government suspended peace talks for three days after the Houthi movement and its allies took control of a military base north of Sanaa. A deal was consolidated to carry out a major prisoner swap between the Houthi rebels and the Saudi-led coalition. The United Kingdom (UK) sought further assurance that Saudi Arabia was not using decades-old UK-made cluster bombs, which are now illegal, in their airstrikes. The United States (US) Department of Defence publicly acknowledged the presence of US troops in Yemen, assisting in the fight against al-Qaida affiliates. Houthi rebels have been alleged of carrying out large-scale, unjustified detentions. Saudi Arabia intercepted and destroyed a ballistic missile launched from Yemen, leading the coalition to reconsider its truce with the Houthi. An Islamic State (IS) attack killed over 40 people in Aden, of which the deceased were mainly new government army recruits. A bomb at Sanaa University killed a gardener and injured at least two students. A series of suicide attacks, claimed by IS, killed at least 41 people in the city of Mukalla over a week. The United Nations (UN) called for the establishment of an emergency economic rescue body in order to prevent the collapse of Yemen's economy. Al Qaeda continues to obtain oil profits from smuggled fuel in Yemen. The UN announced it would start inspecting commercial shipments to Yemen. Al Qaeda in the Arabian Peninsula (AQAP) posed a rising threat to merchant ships in vital waterways near Yemen.