The Hamas-run Gaza Strip's health ministry said Wednesday war with Israel has killed more than 21,000, as Israel kept pounding the besieged territory with air strikes and shelling.The World Health Organization (WHO) said Gazans were in "grave peril" after more than 11 weeks of fighting -- triggered by Hamas's deadly October 7 attacks on Israel -- which left most hospitals in the Palestinian territory out of action and led to "acute hunger".