Militants of unknown affiliation fired rockets at United Nations World Food Program (UNWFP) planes on 8 June near Luena and again near Kuito a few days later. As the first plane, a Boeing 727, approached Luena someone shot a missile at the aircraft, damaging one engine but not critically as the three-man crew landed successfully. The plane's altitude, , most likely prevented the assailant from identifying his target. As the citizens of Luena had enough food to last them several weeks, the UNFWP temporarily suspended their flights. When the flights began again a few days later, militants shot at a plane flying to Kuito, the first attack targeting UN workers since 1999. The UNWFP again suspended food aid flights throughout the country. While he did not claim responsibility for the attack, UNITA spokesman Justino said the planes carried weapons and soldiers rather than food, making them acceptable targets. UNITA and the Angolan government both said the international community needed to pressure the other side into returning to the negotiating table. Despite the looming humanitarian crisis, neither side guaranteed UNWFP planes safety. Kuito, which had relied on international aid, only had enough food to feed their population of 200,000 until the end of the week. The UNFWP had to fly in all aid to Kuito and the rest of the Central Highlands because militants ambushed trucks. Further complicating the situation, potholes in the Kuito airport strip slowed aid deliveries. Overall chaos reduced the amount of available oil to the point at which the UN had to import its jet fuel.