President Hadi and the Gulf Cooperation Council (GCC) rejected the formation of a transitional political council for the separation of southern Yemen on 14 May. A state of emergency was declared on 15 May in the rebel-held capital of Sanaa after a major outbreak of cholera. The minister of foreign affairs for Oman, Yusuf bin Alawi, reiterated Oman’s support for President Hadi’s internationally backed government during a meeting with Yemen’s deputy prime minister on 15 May. Negotiations between President Hadi’s government and Houthi rebels took place in Oman in an attempt by the United Nations (UN) to resume full peace talks. Human rights groups have criticised the USD 110 billion arms deal made by President Donald Trump and the Saudi Arabian government on 23 May. On 27 May, Human Rights Watch (HRW) encouraged all warring factions in the Yemeni conflict to release all wrongfully held detainees and to reveal the whereabouts of all prisoners who have forcibly disappeared. A Saudi drone was destroyed by Houthi rebels in the northern province of Hajjah on 14 May. The UN special envoy to Yemen, Ismail Ould Cheickh Ahmed, highlighted deep concerns for his safety and that of UN workers in Yemen after his convoy was attacked as he travelled from the airport to the UN compound in Yemen on 22 May. A raid by United States (US) marines killed seven suspected al-Qaeda militants but also killed several civilians in the Marib governorate on 23 May. Forces backed by the United Arab Emirates (UAE) regained control of Aden airport in the south of Yemen on 31 May.