The Israel Defense Forces on Sunday said it had destroyed a border-crossing Hamas attack tunnel, the third in recent months, that penetrated hundreds of meters into both Israeli and Egyptian territory from the Gaza Strip, in an airstrike in southern Gaza on Saturday night.

“We completed the destruction of a third terror tunnel,” spokesperson Lt. Col. Jonathan Conricus told reporters early Sunday morning, denying claims made by Hamas that it was a smuggling tunnel.

The tunnel, which was constructed differently from most tunnels in Gaza, began in the city of Rafah and crossed into Israel under the Kerem Shalom Crossing, through which hundreds of trucks ordinarily cross into the coastal enclave with goods from Israel each day, he said.

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“We understand this tunnel belongs to Hamas,” Conricus added, saying the military believed the terror group saw it as a “significant asset.”

That assessment came from the fact that the tunnel ran underneath the Gaza crossing, which was kept closed on Sunday, as well as below the gas and diesel pipelines into the Strip and a nearby IDF post, he said.

“This is a severe breach of Israel’s sovereignty, a serious threat to Israeli civilians and a threat to the humanitarian efforts that Israel allows for the people in the Gaza Strip,” the military said in a statement.

The army spokesperson credited the discovery and destruction of the tunnel to a combination of “cutting-edge” technology and intelligence.

It was the third tunnel entering Israeli territory destroyed by the IDF in under three months. On October 30, the army blew up an attack tunnel that belonged to the Iran-backed Palestinian Islamic Jihad terrorist group, in the process killing 12 members of the organization, along with two Hamas operatives. On December 10, the military demolished a second tunnel, this one controlled by Hamas.

However, in both of those cases, the tunnels were destroyed from inside Israeli territory, unlike the one on Saturday night, which was hit from inside Gaza by Israeli jets, Conricus said.

“If you do something once, it’s a chance; if you do something twice, it’s a coincidence; if you do something three times, there’s a method,” he said, hinting at further tunnel demolitions to come.

IDF Chief of Staff Gadi Eisenkot made the destruction of Palestinian terror groups’ attack tunnel a top priority for the military, following the 2014 Gaza war, which saw extensive use of tunnels by the Hamas terrorist group.

Over the past year, the army has been constructing an underground barrier around the Gaza Strip that is meant to block attempts to dig into Israel.

Military officials have noted that more tunnels will likely be destroyed in coming months as the barrier nears completion.

Conricus’s comments marked the first time an army official has publicly acknowledged that the military has the capability to successfully strike tunnels from the air, though others have alluded to it in the past.

Last week, the IDF also struck what many assumed to be a tunnel in the Gaza Strip, following a series of mortar attacks.

In its statement at the time, the army referred to the target of the attack on January 4 as “significant terror infrastructure.”

According to official Palestinian media, that “infrastructure” was farmland in the southern Gaza Strip, prompting many to assume that it was, in fact, a tunnel beneath the field, though not necessarily one that crossed into Israeli territory.

The message to the leaders of Gaza and its citizens is clear — invest in the sanctity of life and not in [digging your own] catacombs

On Twitter, Defense Minister Avigdor Liberman praised the IDF’s “professional and accurate” Saturday night airstrike.

“The destruction of the attack tunnel network is a key feature of our policy of consistently striking Hamas’s strategic capabilities,” Liberman wrote Sunday morning. “The message to the leaders of Gaza and its citizens is clear — invest in the sanctity of life and not in [digging your own] catacombs.”

Earlier, Prime Minister Benjamin Netanyahu, before taking off for an official visit to India, threatened Hamas with “even greater force” following the Saturday night strike.

“This evening the IDF attacked Hamas’s central terror infrastructure in the Gaza Strip,” he said. “There are those who have said the IDF just targeted sand dunes — this is incorrect. Hamas must understand that we will not tolerate the continuation of these attacks and will respond with even greater force.”

The army denied the claim made by Hamas late Saturday night that the Israeli jets had targeted a smuggling tunnel between the Gaza Strip and Egypt.

“We know it’s a terror tunnel because it passes under different strategic assets,” Conricus said, referring to its proximity to the fuel pipelines into Gaza, the Kerem Shalom Crossing and a military installation nearby.

The army spokesperson also denied earlier reports in Hebrew media that the jets had targeted a shipment of long-range missiles into Gaza.

According to Conricus, the tunnel was dug in the southern Gaza city of Rafah, some 900 meters from Israel, and extended 180 meters into Israeli territory.

On the other end, it also extended hundreds of meters into Egypt, which could have allowed fighters in Gaza to attack Israeli positions from the Sinai Peninsula, he said.

Asked if the tunnel could have functioned as both a smuggling and attack tunnel, the army spokesperson responded, “It could have, but we deal with the infrastructure.”

As the tunnel entered Egyptian territory, the army was in contact with Cairo about its destruction, Conricus said, but would not elaborate on the extent of the cooperation.

The tunnel’s design was out of the ordinary, not matching the size of some larger tunnels and lacking the domed roof of smaller attack tunnels.

The strike came shortly after the military announced it would not be opening the Kerem Shalom Crossing into the Gaza Strip on Sunday, following a “situational assessment.”

It is the second time Kerem Shalom has been closed in under a month.

Israel shut down the crossing on December 14 following multiple rocket and mortar attacks from Gaza, along with Erez Crossing, through which people enter and exit the Strip. Erez reopened a day later, and Kerem Shalom was reopened on December 17.

On Friday, approximately 1,000 Palestinians took part in violent demonstrations in four locations along the security fence surrounding Gaza, rolling burning tires and throwing rocks at the barrier and the soldiers on the other side, according to the Israel Defense Forces.

In response, “troops fired live rounds selectively toward three main instigators, who posed a threat to IDF soldiers and the security fence,” the army said.

The Hamas-run Gaza health ministry said dozens of Palestinians were injured by live fire, rubber bullets and tear gas during the riots.

On Saturday, the Defense Ministry’s chief liaison to the Palestinians warned residents of the Gaza Strip that the Hamas terror organization was using them in its quest for violence against Israel.

“Hamas terrorists send young people to riot at the [Gaza border]… while hiding behind them and claiming that these riots are spontaneous and peaceful,” Maj. Gen. Yoav Mordechai, the Coordinator of Government Activities in the Territories (COGAT), said on Facebook.

Times of Israel staff contributed to this report.