An unknown number of aid workers are missing after air strikes hit a hospital in South Sudan, near the Ethiopian border, a charity group says. The hospital, run by medical charity Doctors Without Borders (MSF) in Jonglei state, was struck during the night by government forces. Following this incident, MSF reported an attack on their health facility in Pieri, which left it unusable due to looting by unknown attackers. The whereabouts of the aid workers remain unclear as they fled alongside the local community amidst the chaos. The outbreak of violence in Jonglei has heightened fears of a return to full-scale civil war, with the United Nations estimating 280,000 people displaced since December. Ongoing hostilities between government troops and opposition forces loyal to First Vice-President Riek Machar, who is currently facing a trial on serious charges, have further complicated the humanitarian crisis. MSF has indicated that its facilities are crucial for around 250,000 residents in the area, and repeated assaults on healthcare provision are unacceptable for providing vital medical assistance.