Israeli forces are responding to an unprecedented early-morning attack by Islamist Hamas militants by launching strikes by land and air on the Gaza Strip following weeks of rising tensions along the region’s volatile border. Saturday’s surprise attack from Hamas, which came during a major Jewish holiday and followed the 50th anniversary of the start of the 1973 Yom Kippur war, has led to Israel’s deadliest day in at least 75 years. Israeli Prime Minister Benjamin Netanyahu said Saturday that “we are at war, and we will win it.” President Biden in an address reaffirmed his “unwavering” support for Israel’s security and warned Israel’s foes against taking advantage of the “appalling” attacks.