 23-year-old Nadal Kferne is living at the school and witnessed the explosion. He says he ran to try to help. He described a scene of horrific carnage where kids had been playing. He says he collected the parts of one child's body so the child could be buried whole. The Israeli military says the school had been used by Hamas as an operational facility and that, quote, numerous steps were taken in order to mitigate the risk of harming civilians.