Israel threatens to expand war if Hezbollah truce collapses

Israel threatened on Tuesday to return to war in Lebanon if its truce with Hezbollah collapses, and said this time its attacks would go deeper and target the Lebanese state itself, after the deadliest day since the ceasefire was agreed last week.

In its strongest threat since the truce was agreed to end 14 months of war with Hezbollah, Israel said it would hold Lebanon responsible for failing to disarm militants who violated the truce.

"If we return to war we will act strongly, we will go deeper, and the most important thing they need to know: that there will be no longer be an exemption for the state of Lebanon," Defence Minister Israel Katz said.

"If until now we separated the state of Lebanon from Hezbollah... it will no longer be [like this]," he said during a visit to the northern border area.

Despite last week's truce, Israeli forces have continued strikes in southern Lebanon against what they say are Hezbollah fighters ignoring the agreement to halt attacks and withdraw beyond the Litani River, about 30km from the frontier.

On Monday, Hezbollah shelled an Israeli military post, while Lebanese authorities said at least 12 people were killed in Israeli airstrikes on Lebanon.

Katz called the Hezbollah attack "the first test" and described Israel's strikes as a strong response.

The Beirut government must "authorise the Lebanese army to enforce their part, to keep Hezbollah away beyond the Litani, and to dismantle all the infrastructure," Katz said.

"If they don't do it and this whole agreement collapses then the reality will be very clear."

Top Lebanese officials urged Washington and Paris to press Israel to uphold the ceasefire, after dozens of military operations on Lebanese soil that Beirut has deemed violations, two senior Lebanese political sources told Reuters on Tuesday.

The sources said caretaker Prime Minister Najib Mikati and Speaker of Parliament Nabih Berri, a close Hezbollah ally who negotiated the deal on behalf of Lebanon, spoke to officials at the White House and French presidency late on Monday.

Mikati, quoted by the Lebanese news agency, said that diplomatic communications had intensified since Monday to stop Israeli violations of the ceasefire. He also said a recruitment drive was under way by the Lebanese army to strengthen its presence in the south.

US State Department spokesperson Matt Miller told reporters on Monday that the ceasefire "is holding" and that the US had "anticipated that there might be violations".

"There is an urgency to finalise the mechanism, otherwise it will be too late," the source said, referring to Israel's gradual intensification of strikes despite the truce.