DEIR AL-BALAH, Gaza Strip — At least 38 Palestinians were killed overnight and into Wednesday in the Gaza Strip while seeking aid from United Nations convoys and sites run by an Israeli-backed American contractor, according to local health officials. The Israeli military said it had fired warning shots when crowds approached its forces. Another 25 people, including several women and children, were killed in Israeli airstrikes, according to local hospitals in Gaza. The military said it only