Israel hit a Gaza school on Thursday with what it described as a targeted airstrike on up to 30 Hamas fighters inside, while a Hamas official said 40 people including women and children were killed as they sheltered in the U.N. site. The strike took place at a sensitive moment in mediated negotiations on a ceasefire agreement entailing the release of hostages seized by Hamas on Oct. 7 and some of the Palestinians held in Israeli jails. Hamas seeks a permanent end to the war. Israel says...