The country has vowed an unprecedented offensive against the Islamic militant group ruling Gaza after its fighters broke through the border fence and stormed into the country’s south, gunning down hundreds of Israelis in their homes, on the streets and at an outdoor music festival. They dragged an estimated 150 people – soldiers, men, women, children and the elderly – into captivity in Gaza. As Palestinians crowded into U.N. schools and a shrinking number of safe neighborhoods, humanitarian groups pleaded for the creation of corridors to get aid into Gaza, warning that hospitals overwhelmed with wounded people were running out of supplies. Israel has stopped entry of food, fuel and medicine into Gaza, and the sole remaining access from Egypt was shut down Tuesday after airstrikes hit near the border crossing. The war, which has already claimed at least 2,100 lives on both sides, is expected to escalate.