 On 31 May, fighters loyal to STC captured Aden airport from Hadi loyalists, killing two men.The Aden airport issue first erupted when Hadi himself was refused landing permission in early February and had to land instead on the Yemeni island of Socotra before he made another attempt to fly back into Aden.Hadi then had Brigadier General Muhran Qabati, commander of the Fourth Brigade - which acts as the presidential bodyguard - lay siege to the airport, and clashes between the two sides followed.