The U.N. humanitarian office (OCHA) said that more than 4,00,000 people had fled their homes in the Gaza Strip and 23 aid workers had been killed since the start of Israeli retaliatory strikes in response to a deadly Hamas incursion. The agency launched an appeal for nearly $294 million to help some 1.3 million people in Gaza and the West Bank, of which nearly half was programmed for food aid as supplies run out.