There’s been no letup in Israel’s bombing campaign. In one of the latest attacks, at least 20 Palestinians were killed when Israeli forces bombed the Nuseirat refugee camp in central Gaza. Palestinian officials say more than 13,300 Palestinians have been killed by Israeli strikes — over 5,000 of them children. On Monday, U.N. Secretary-General António Guterres marked World Children’s Day, the U.N.’s annual day of action for children, with a call to stop the carnage.

Secretary-General António Guterres: “What is clear is that we have had in a few weeks thousands of children killed. So this is what matters. We are witnessing a killing of civilians that is unparalleled and unprecedented in any conflict since I am secretary-general.”