Hezbollah chief Hassan Nasrallah has been killed, the Lebanese movement said Saturday. Hezbollah's statement came after Israel's military said it had killed Nasrallah in an air strike on Beirut's southern suburbs.
Iran too said a senior member of its Revolutionary Guard Corps was killed in the same strike.
"Sayyed Hassan Nasrallah, Secretary General of Hezbollah, has joined his great, immortal martyr comrades whom he led for about 30 years," Hezbollah said in a statement.
It said he was killed with other group members "following the treacherous Zionist strike on the southern suburbs" of Beirut.
AFP journalists heard a passer-by scream "Oh my God!", and women weeping in the streets after Hezbollah announced the news.
Nasrallah had enjoyed cult status among his supporters and was the only man in Lebanon with the power to wage war or make peace.
"Hassan Nasrallah is dead," Israeli Lieutenant Colonel Nadav Shoshani announced earlier on X.
In Tehran, posters of Nasrallah were erected bearing the slogan "Hezbollah is alive".
Iran's foreign ministry spokesman Nasser Kanani posted on X that Nasrallah's "sacred goal will be realised in the liberation of Quds (Jerusalem), God willing".
Earlier, Iran's supreme leader Ayatollah Ali Khamenei condemned Israel's "short-sighted and stupid policy".
Hamas condemned Nasrallah's killing as a "cowardly terrorist act". Israel has shifted the focus of its operation from Gaza to Lebanon, where heavy bombing has killed more than 700 people, according to Lebanon's health ministry, as cross-border exchanges escalated over the past week.
Most of those Lebanese deaths came on Monday, the deadliest day of violence since Lebanon's 1975-90 civil war.
The United Nations said around 118,000 people have been displaced.
Israel's military said most of the senior leaders of Hezbollah have been “eliminated", and added that it had hit more than 140 Hezbollah targets in Lebanon since Friday night.
The military continued to pound Hezbollah's south Beirut stronghold into Saturday, sending panicked families fleeing.
An AFP photographer said dozens of buildings have been destroyed. The blasts that rocked southern Beirut late Friday were the fiercest there since Israel and Hezbollah last went to war in 2006.
In the Haret Hreik neighbourhood, an AFP photographer saw craters up to five metres (16 feet) wide.
Middle East expert James Dorsey described Friday's attack as "very sophisticated", adding it "demonstrates not only significant technological capacity but just how deeply Israel has penetrated Hezbollah".
Shoshani said Saturday there was "still a way to go" in Israel's fight against Hezbollah, adding that it was believed to have "tens of thousands of rockets".
Warnings to leave
After Friday's heavy strikes, Israel issued fresh warnings for people to leave part of the densely populated southern Dahiyeh suburbs before dawn.
Hundreds of families spent the night outside, in central Beirut's Martyrs' Square or along the seaside boardwalk. "I didn't even pack any clothes, I never thought we would leave like this and suddenly find ourselves on the streets," South Beirut resident Rihab Naseef, 56, told AFP.
Israel's military also announced strikes Saturday in the Bekaa area in eastern Lebanon and on the south.
It said a surface-to-surface missile from Lebanon fell in an open area in central Israel and another was intercepted in the north. Hezbollah claimed a rocket attack on Kabri in northern Israel. It later said it launched "a salvo of Fadi-3 rockets" towards the Ramat David airbase in northern Israel, which it has targeted before.
Israeli Prime Minister Benjamin Netanyahu has vowed to keep fighting Hezbollah until the northern border with Lebanon is secured. "Israel has every right to remove this threat and return our citizens to their homes safely," he said.
Iranian general killed
Israel has raised the prospect of a ground operation against Hezbollah, prompting widespread international concern. "We must avoid a regional war at all costs," UN chief Antonio Guterres told world leaders, again appealing for a ceasefire.
Diplomats have said efforts to end the war in Gaza were key to halting the fighting in Lebanon and bringing the region back from the brink.
Israel's retaliatory military offensive has killed at least 41,586 people in Gaza, most of them civilians, according to figures provided by the Hamas-run territory's health ministry. The UN has described the statistics as reliable. The Lebanon violence has raised fears of a wider spillover.