UN agency warns its fuel will run dry on Wednesday as Palestinian officials say 700 Gazans killed in a single day

​ The main United Nations agency working in Gaza said it will be forced to halt its operations by Wednesday evening due to a lack of fuel, exacerbating a humanitarian crisis, as Israeli airstrikes on the besieged strip killed more than 700 people in 24 hours, according to Palestinian officials. Read More Breaking News, Latest News and Videos | CNN