Harsh rhetoric from Israel and Lebanon's Hezbollah appeared to threaten further conflict after border unrest this week, but experts predict both sides will try to avoid escalation.

As the coronavirus pandemic has deepened Lebanon's economic turmoil and also rocked Israeli politics, the last thing either of the arch foes wants now is a new military conflict, they argue.

Tensions spiked last Monday along the UN-demarcated Blue Line after months of relative calm when Israel said it thwarted an infiltration attempt by up to five Hezbollah gunmen, a claim denied by the Iran-backed group.

Israeli soldiers monitor the country's border with Lebanon near the northern town of Metula on July 14
Israeli soldiers monitor the country's border with Lebanon near the northern town of Metula on July 14 AFP / JACK GUEZ

Israel reported an exchange of fire that forced the "terrorists" back into Lebanon and said it fired artillery across the heavily guarded border for "defensive" purposes.

The incident came a week after an alleged Israeli missile attack hit positions of Syrian regime forces and their allies south of Damascus on July 20, killing five, including a Hezbollah member.

Hezbollah said at the time a response to the deadly Syria strike was "inevitable", heightening tensions.

Prime Minister Benjamin Netanyahu warned Monday that Hezbollah was "playing with fire" and that Israel's response to the border incursion would "be very strong".

The United Nations peacekeeping force (UNIFIL) on patrol along the southern Lebanese border with Israel near the northern Israeli town of Metula on July 28
The United Nations peacekeeping force (UNIFIL) on patrol along the southern Lebanese border with Israel near the northern Israeli town of Metula on July 28 AFP / Mahmoud ZAYYAT

Since then the Israel Defense Forces (IDF) remain on "alert" to see if Hezbollah is "going to do anything else," said analyst Orna Mizrahi of the Institute for National Security Studies.

However, Mizrahi, who previously served in Netanyahu's national security office, argued that a full-blown escalation now was in neither side's interest.

With the pandemic wreaking havoc -- especially in Lebanon, stuck in its deepest economic crisis since the 1975-1990 civil war -- she argued that "both sides don't want a conflict now".

Armoured vehicles and 155 mm self-propelled howitzers are deployed in the Upper Galilee in northern Israel on the border with Lebanon on July 27
Armoured vehicles and 155 mm self-propelled howitzers are deployed in the Upper Galilee in northern Israel on the border with Lebanon on July 27 AFP / JALAA MAREY

The last major conflict between Israel and Hezbollah broke out in 2006. A month of fighting left more than 1,200 Lebanese dead, mostly civilians, and killed 160 Israelis, mostly soldiers.

The Blue Line has remained tense ever since, as an AFP team experienced on a visit last month, 10 days before the border incident.

Officer Jonathan Goshen said Israeli forces could see Hezbollah "preparing for the next war".

The Israeli northern town of Metula in the foreground and the Lebanese southern plain of Marjayoun
The Israeli northern town of Metula in the foreground and the Lebanese southern plain of Marjayoun AFP / JACK GUEZ

Hezbollah's military presence along the Blue Line is not immediately visible to visiting reporters, but a March report from the United Nations said the group has fighters and weapons deployed there.

"The border looks calm, but it isn't," Goshen told AFP, weaving in a Jeep amid the trees near Metula, the northernmost village on the Israeli side.

According to Goshen, when Israeli forces approach the Blue Line, "it's quiet for the first 10 minutes and then we see them coming all the time, trying to collect intelligence".

During AFP's visit, a small group was visible moving among the fruit trees on the Lebanese side, sparking heated discussion among IDF troops on whether they were Hezbollah or farmers.

"Hezbollah!" Goshen said, before ordering his soldiers to pull back.

Hezbollah specialist Didier Leroy of the Royal Higher Institute for Defence also argued that the group remains primarily focused on the turmoil gripping Lebanon, which has seen protests since last year against a political system widely deemed corrupt and incompetent.

The demonstrations, which have also shaken Hezbollah strongholds, are a "significant factor" in its calculations, he said, adding that "the atmosphere in Lebanon is not favourable for a hardline anti-Israel agenda".

While Israel's financial crisis is less severe, the Jewish state is struggling to contain surging coronavirus transmission while street protests over economic hardship, and against right-wing Netanyahu's leadership, have grown by the week.

Nahum Barnea of the Yediot Aharonoth newspaper, one of Israel's most prominent columnists, reported that when the gunmen crossed the Blue Line, IDF soldiers were ordered to take extraordinary steps to avoid an escalation.

"What made the engagement unusual, maybe even unprecedented, was the unequivocal (do not kill) order that the IDF soldiers were given," Barnea wrote.

The Israeli army declined to comment when asked by AFP if its soldiers indeed had orders to refrain from using lethal force.

Barnea, in his column, argued that "the logic behind the decision is clear: killing members of the cell would have necessarily led to a day of fighting in the north, and maybe more than one day.

"The decision-makers faced the imbroglio from 2006: they didn't want to roll into the Third Lebanon War."