Israel threatens to expand war if Hezbollah truce ends

Israel has threatened to return to war in Lebanon if its truce with Hezbollah collapses and says 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 air strikes 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 the United States and France to press Israel to uphold the ceasefire after dozens of military operations on Lebanese soil that it 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.

An Israeli air strike on a car near Syria's capital Damascus on Tuesday killed Salman Jumaa, a senior Hezbollah figure responsible for liaising with the Syrian army, a Lebanese security source told Reuters.

The Israeli military confirmed in a later statement taking out Jumaa in what it called an intelligence-based strike in Damascus, saying his killing "degrades both Hezbollah's presence in Syria and Hezbollah's ongoing force-building efforts".

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

French Foreign Minister Jean-Noel Barrot spoke to his Israeli counterpart Gideon Saar on Monday, saying both sides should adhere to the ceasefire.

The truce came into effect on November 27 and prohibits Israel from conducting offensive military operations in Lebanon while requiring Lebanon to prevent armed groups including Hezbollah from launching attacks on Israel.

It gives Israeli troops 60 days to withdraw from south Lebanon.

A mission chaired by the United States is tasked with monitoring, verifying and helping enforce the truce but it has yet to begin work.

Berri on Monday called on the mission to "urgently" ensure Israel halts its breaches, saying Lebanon had logged at least 54 Israeli violations of the ceasefire so far.

Israel has said its continued activity in Lebanon is aimed at enforcing the ceasefire.

Lebanon's Mikati met in Beirut on Monday with US General Jasper Jeffers, who will chair the monitoring committee.

Two sources familiar with the matter told Reuters that France's representative to the committee, General Guillaume Ponchin, would arrive in Beirut on Wednesday and that the committee would hold its first meeting on Thursday.

"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.