Iran said early on Wednesday that its missile attack on Israel was over barring further provocation, while Israel and the US promised to retaliate against Tehran as fears of a wider war intensified.
Washington said it would work with longtime ally Israel to make sure Iran faced "severe consequences" for Tuesday's attack, which Israel said involved more than 180 ballistic missiles.
The United Nations Security Council scheduled a meeting about the Middle East for Wednesday, and the European Union called for an immediate ceasefire.
Israel renewed its bombardment early on Wednesday of Beirut's southern suburbs, a stronghold of the Iran-backed armed Hezbollah group, with at least a dozen airstrikes against what it said were targets belonging the group.
Large plumes of smoke were seen rising from parts of the suburbs. Israel issued new evacuation orders for the area, which have largely emptied after days of heavy strikes.
Iran's attack marked it biggest ever military blow against Israel.
Nearly 1,900 people have been killed and more than 9,000 wounded in Lebanon in almost a year of cross-border fighting, most in the past two weeks, according to Lebanese government statistics on Tuesday.