The Israeli military on Thursday called on a United Nations peacekeeping force and the Lebanese military to destroy a Hezbollah cross-border attack tunnel it says entered Israeli territory in the western Galilee, after uncovering another underground passage two days earlier in the eastern part of the region.

Those tunnels, as well as a third that the Israel Defense Forces said it was working to uncover in the western Galilee, were found as part of the military’s newly launched operation to find and destroy Hezbollah attack tunnels, dubbed Northern Shield.

The Israeli army called for assistance from the peacekeeping force UNIFIL and the Lebanese Armed Forces in neutralizing the threat of one of the tunnels from within Lebanon as it was struggling to locate an opening to the underground passage on the Israeli side of the border.

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An army spokesperson said the military was confident that the tunnel existed and had penetrated into Israeli territory, but the IDF was thus far unable to locate a specific opening to it due to the rocky earth and recent inclement weather.

According to the IDF, the tunnel originated in the Lebanese village of Ramyeh underneath a number of homes and crossed into Israeli territory near the village of Zarit.

The first tunnel was discovered south of the Israeli village of Metulla in the northern tip of the Galilee panhandle.

The Israeli military said it believes the tunnels were meant to be used by Hezbollah as a surprise component of an opening salvo in a future war, alongside the mass infiltration of operatives above ground and the launching of rockets, missiles and mortar shells at northern Israel.

A senior Israeli official on Thursday said the tunnels discovered inside Israel were large enough to be used by “entire battalions” to enter Israeli territory in order to “carry out killing sprees and kidnappings and to capture Israeli towns and villages.”

Prime Minister Benjamin Netanyahu elaborated, briefing foreign envoys at the northern border: “If you look at the Hamas tunnels, they’re very narrow, basically for one person. The Hezbollah tunnels are broad. They enable several people to come at one and also to put motorcycles, I’m pretty sure tractors and so on.”

This, Netanyahu said, was “in order to bring in many forces, simultaneously, which means several battalions into our territory, with the purpose of cutting off communities here, towns, kibbutzim, and then going into a campaign of murder and kidnapping, which could happen simultaneously.”

The army confirmed it had soldiers operating at a third location, also in the western Galilee, and IDF spokesperson Lt. Col. Jonathan Conricus said there were other sites where the military believed Hezbollah had dug tunnels into Israeli territory.

The number of tunnels the IDF believes the Lebanese terror group has dug into Israel, as well as other information connected to the army’s tunnel-busting operation, cannot be published by order of the military censor.

According to Conricus, the tunnel from the predominantly Shiite village of Ramyeh was not yet operational as it lacked an exit point and did not present an immediate threat to residents of the area, as with the tunnel discovered on Tuesday.

However, unlike the tunnel discovered near the Israeli village of Metulla on Tuesday, which the IDF said it planned to “neutralize” itself, in the case of the tunnel from Ramyeh, the Israeli military called on the UN peacekeeping force UNIFIL and the Lebanese Armed Forces to destroy it.

UNIFIL did not immediately confirm that it had received such a request from Israel.

On Thursday, UNIFIL commander Maj. Gen. Stefano Del Col visited Israel and toured the border where Israel has been searching for Hezbollah tunnels, including the one uncovered near Metulla, which the IDF says was dug from the Lebanese village of Kafr Kila.

During the visit, IDF Northern Command chief Maj. Gen. Yoel Strick also provided Del Col with a map showing the origin of the tunnel in Ramyeh, along with additional intelligence information about it, the IDF said.

Strick also lodged a complaint with UNIFIL about what he called Hezbollah’s violation of UN Resolution 1701, which the peacekeeping force is meant to enforce. The resolution ended the 2006 Second Lebanon War and called for all armed groups besides the Lebanese military to remain north of the country’s Litani River.

“The IDF sees the Lebanese government, Lebanese military and UNIFIL as responsible for all that happens in Lebanon and for the enforcement of Resolution 1701,” the army said in a statement.

Earlier on Thursday, a senior Israeli official threatened that the IDF may be forced to extend its current tunnel-busting operation across the border and into Lebanese territory.

“It is possible that we will be required to act inside Lebanon,” the official said, speaking on condition of anonymity.

Operation Northern Shield was launched earlier this week due to the fear that the details of the operation would be leaked and revealed to Hezbollah, the senior official said.

“If Hezbollah knew that we knew [about the existence of the tunnels] then this would accelerate their kidnapping efforts, and we did not want to get to a situation where the kidnappers infiltrate into Israel and abduct a soldier or a civilian, and no one would know anything about it,” the senior official said.

The decision to embark on the operation was made on November 7, and was one of the reasons the cabinet decided not to launch a major military campaign against Hamas in Gaza, the official added. “There were other reasons, too, but that was one of them,” he said.

Also on Thursday, Netanyahu briefed foreign diplomats about the army’s ongoing operation, urging them to condemn and sanction the Shiite terror group for its aggressive actions.

“Israel expects an unequivocal condemnation of Hezbollah, the imposition of additional sanctions on Iran, a condemnation from the Lebanese government and a demand that it stop giving its approval for the use of its territory for these attacks against Israel,” he told a group of senior ambassadors from across the globe.

“All of this will come up at the upcoming meeting of the UN Security Council which Israel has demanded. This is an important political and diplomatic step that complements our operational and engineering effort to deny Hezbollah and Iran the tunnels weapon.”

PM Netanyahu briefed ambassadors today on the Hizballah tunnel threat. We visited tunnel site close to the Blue Line. UK condemns such tunnels as blatant and destabilising violation of UN resolutions. pic.twitter.com/YQZv7Ruj8C — David Quarrey (@DavidQuarrey) December 6, 2018

“We are systematically and decisively denying our enemies the tunnels weapon. We are doing this with Hamas, and with Hezbollah; we will do whatever is necessary,” he added.

“Anyone who attacks us is taking his life into his hands,” he added. “Hezbollah knows this and Hamas knows that too.”

Operation Northern Shield has just begun, but at the end of it, “the tunnels weapon, in which Hezbollah has invested so much, will not exist and will not be effective.”

Netanyahu also spoke to the foreign diplomats about Iran, calling the Islamic Republic Israel’s greatest enemy.

“What we’re facing is one big enemy. That enemy is called Iran,” he said.

“Iran is trying to act on two levels: one is to develop a nuclear arsenal. We are dealing with that with other means including exposing the nuclear archive and the secret nuclear warehouse in Tehran. The second thing that Iran is doing is developing conventional weapons against us in their declared war to annihilate Israel. They declare so openly everyday.”

More than a dozen ambassadors participated in the briefing on a foggy Thursday morning, including those from the European Union, France, the UK, Russia, Hungary and Poland.

Raphael Ahren contributed to this report.