Beirut:Lebanon said Israeli air strikes on Saturday killed more than 55 people, many of them in central Beirut, as Israel's defence minister vowed decisive action against Hezbollah, in a call with his US counterpart.
On Israel's second front, the more than 13-month war with Hamas militants in Gaza, rescuers said pre-dawn Israeli air strikes and tank fire killed 19 people and wounded more than 40.
Hamas's armed wing said an Israeli hostage, captured during the group's attack in October last year which triggered the war, had been killed. Israel's military said it could neither "confirm nor refute" the claim.
After nearly a year of limited cross-border exchanges of fire, in which Lebanon's Hezbollah said it was acting in support of Hamas, Israel escalated air strikes against Hezbollah targets in Lebanon on September 23.
A week later it sent in ground troops to southern Lebanon.
One strike on Saturday in the heart of Beirut brought down a residential building and jolted residents across the city.
The strike on the working-class Basta neighbourhood killed at least 20 people and wounded 66, Lebanon's health ministry said in a revised toll.
"We saw two dead people on the ground... The children started crying and their mother cried even more," said Samir, 60, who lives in a building facing the one destroyed.
The attack in the capital was followed by others in the city's southern suburbs after calls by the Israeli military to evacuate.
Israel has not commented on the strike in central Beirut but said it had again hit Hezbollah targets in the city's southern suburbs, a stronghold of the Iran-backed group.
A military statement said that over the past week, the air force "struck dozens of Hezbollah command centres, weapons storage facilities, and terrorist infrastructure in the Dahieh area".
Diplomatic resolution
A Lebanese security source told AFP that the central Beirut strike had "targeted a leading Hezbollah figure", but a Hezbollah lawmaker, Amin Sherri, denied to Lebanese media that any official was present at the time of the attack.
Similar strikes carried out without warning outside of Hezbollah's traditional bastions -- which include southern Beirut but not the centre -- have tended to target senior figures.
The health ministry said Israeli air strikes also hit eastern Lebanon, killing 24 people including 13 in the town of Shmostar overlooking the Bekaa Valley, another Hezbollah stronghold.
In Lebanon's south, at least 14 were killed including five in the coastal city of Tyre, the ministry said.
In a telephone call with Israeli Defence Minister Israel Katz on Saturday, Washington's Defense Secretary Lloyd Austin "reiterated US commitment to a diplomatic resolution in Lebanon that allows Israeli and Lebanese civilians to return safely to their homes on both sides of the border", a Pentagon spokesperson said.