The United Nations and the International Committee of the Red Cross are warning the residents of Gaza are facing serious food shortages and on the brink of a humanitarian crisis. Some 15,000 Palestinians in northern Gaza have been living under siege without access to food, water and hospitals since September 28 when Israel launched a major offensive that has already killed over 100 Palestinians. To compound the problem Al Jazeera reports Israel has blocked international humanitarian staff from the UN from entering Gaza since Sept. 21.