The UN relief operation in Gaza says it has received enough fuel from Israel to continue working for the next 20 days. UN spokesman Chris Gunness said Monday it was "a disgrace" that his organization would be deprived of fuel. On Sunday he said tanks were empty. Gaza residents rely on Israel for all their fuel. The army said it had to stop transferring fuel on Sunday after Palestinian militants attacked supply trucks. About 860,000 of Gaza's 1.4 million people receive aid from the UN. The economic situation has worsened since Hamas overran Gaza in June. Israel closed crossings, cutting off most supplies. Israel stopped all supplies briefly last month after militants attacked the only fuel depot that supplies Gaza.