Israeli airstrikes pounded Gaza, killing more than 400 people, Palestinian health authorities said on Tuesday, threatening the complete collapse of a two-month ceasefire as Israel vowed to use more force to free hostages held by Hamas.<br /><br />Hamas, which still holds 59 of the approximately 250 hostages seized in its October 7, 2023 attack on Israel, accused Israel of breaching the ceasefire and jeopardizing efforts by mediators to secure a permanent truce.<br />
