RAFAH, Gaza Strip—The United Nations and world leaders were pushing Thursday to get immediate aid flowing into the Gaza Strip as the humanitarian crisis worsened for two million Palestinians who are trying to flee deadly Israeli airstrikes and struggling to find food, water and fuel during a near-total siege. 

President Biden said early Thursday that the U.S. had secured a deal with Egypt and Israel to send 20 trucks of humanitarian aid into Gaza as soon as Friday.