Israeli security stands around the wreckage of an F-16 that crashed in northern Israel, near kibbutz of Harduf, Saturday, Feb. 10, 2018. The Israeli military shot down an Iranian drone it said infiltrated the country early Saturday before launching a "large-scale attack" on at least a dozen Iranian and Syrian targets inside Syria, in its most significant engagement since the fighting in neighboring Syria began in 2011. Responding anti-aircraft fire led to the downing of an Israeli fighter plane. (AP Photo/Rami Slush) ***ISRAEL OUT***

Israeli security stands around the wreckage of an F-16 that crashed in northern Israel, near kibbutz of Harduf, Saturday, Feb. 10, 2018. The Israeli military shot down an Iranian drone it said infiltrated the country early Saturday before launching a "large-scale attack" on at least a dozen Iranian and Syrian targets inside Syria, in its most significant engagement since the fighting in neighboring Syria began in 2011. Responding anti-aircraft fire led to the downing of an Israeli fighter plane. (AP Photo/Rami Slush) ***ISRAEL OUT***

JERUSALEM (AP) — In its most serious engagement in neighboring Syria since fighting there began in 2011, Israel shot down an infiltrating Iranian drone Saturday and struck Iranian targets deep in Syria before one of its own jets was downed.

The sudden escalation offers what could be a harbinger of what lies ahead as the Syrian fighting winds down and an emboldened Iran establishes a military presence that Israel vows it will never accept.

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Israel has issued several stern warnings of late about the increased Iranian involvement along its border in Syria and Lebanon. The Israeli Cabinet just held a meeting near the Syrian border to highlight the new threats, which it attributes to Iran’s growing confidence given the success of the government of Bashar Assad in the Syrian civil war thanks to their support.

Israel called the drone infiltration a “severe and irregular violation of Israeli sovereignty” and warned that Iran would be held accountable for its meddling, raising the specter of a larger confrontation in an area that has remained largely stable since a monthlong war between Israel and Hezbollah in Lebanon in 2006.

“This is a serious Iranian attack on Israeli territory. Iran is dragging the region into an adventure in which it doesn’t know how it will end,” Israel’s chief military spokesman, Brig. Gen. Ronen Manelis, said in a special statement. “Whoever is responsible for this incident is the one who will pay the price.”

Prime Minister Benjamin Netanyahu and Defense Minister Avigdor Lieberman convened the top brass at military headquarters in Tel Aviv for long hours of emergency consultations throughout the Jewish Sabbath to discuss their next steps.

Netanyahu said he spoke with Russian President Vladimir Putin and vowed to strike back hard.

“Iran seeks to use Syrian territory to attack Israel for its professed goal of destroying Israel,” he said. “Israel holds Iran and its Syrian host responsible for today’s aggression. We will continue to do whatever is necessary to protect our sovereignty and our security.”

Israel also appealed to the United Nations Security Council to denounce Iran’s aggression and “put an immediate end to Iranian provocations.”

Israel would not confirm whether its aircraft was actually shot down by enemy fire, which would mark the first such instance for Israel since 1982 during the first Lebanon war.

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Israel fears Iran could use Syrian territory to stage attacks or create a land corridor from Iran to Lebanon that could allow it to transfer weapons more easily to Hezbollah — Lebanon’s Iranian-backed political party and militant group sworn to Israel’s destruction. Though Israel has largely stayed out of the Syrian conflict, it has struck weapons convoys destined for Hezbollah — which is fighting alongside Syrian forces — almost 100 times since 2012.

But Israel has refrained from striking Iranian sites directly. Syria has also repeatedly said it will respond to Israeli airstrikes but has rarely returned fire. Both of those trends came to an abrupt end Saturday as a rapid escalation played out in the early morning hours.

At dawn, Israel said it shot down an Iranian unmanned aircraft that penetrated its airspace and then destroyed the Iranian site in central Syria that it said launched it. Upon their return, Israel’s jets came under heavy Syrian anti-aircraft fire and the pilots of one of the F-16s had to eject and the plane crashed in northern Israel. One pilot was seriously wounded and the other one lightly.

In subsequent attacks, the Israeli military said it struck four additional Iranian positions and eight Syrian sites, causing significant damage. The Israeli jets again faced a heavy barrage of anti-aircraft missiles but returned home safely, as large explosions were reported in Syria and warning sirens blared in northern Israel.

Israel says the strikes destroyed the main command and control bunker of the Syrian military and marked its most devastating assault against Syria in decades.

Iran denied Israel’s shooting down of a drone, with Foreign Ministry spokesman Bahram Ghasem calling the account “ridiculous,” while the joint operations room for the Syrian military and its allies insisted the drone had not violated Israeli airspace and was on a regular mission gathering intelligence on Islamic State militants.

Regardless, Hezbollah said Saturday’s developments signaled a “new strategic phase” in engaging Israel, which has been mostly off the guerrilla group’s radar as it has been knee-deep in the fighting in Syria.

Former Syrian lawmaker and political commenter Sharif Shehade said the anti-aircraft fire marked a political decision in Syria to respond to Israeli strikes, and that tensions would continue to rise unless Washington and Moscow intervened to calm the situation.

“It is a decisive decision to confront the Israeli air force and its careless behavior,” he told The Associated Press in Damascus, “I think what happened today is a lesson for Israel.”

However, a former Israeli Air Force pilot, retired Lt. Col. Reuven Ben-Shalom, said the fierce Israeli response actually sent “very clear messages” to the other side, showing Iran how deep Israel’s knowledge was of its activity in Syria.

“The fact that a drone like this is identified, tracked and intercepted so smoothly by the Israeli air force demonstrates our capabilities, demonstrates our resolve not to allow the breach of Israeli sovereignty,” he said. “I think it’s good that our enemies learn and understand these capabilities.”

Military spokesman Lt. Col. Jonathan Conricus said Saturday’s incident marked the most “blatant and severe violation of Israeli sovereignty” yet. He said while Israel had no interest in further escalation it was prepared to “extract a heavy price” for such aggression.

Conricus said Iran was “playing with fire” by directly sending the drone into Israel on a military mission.

Russia, which backs Assad and maintains a large military presence in the country, called for restraint and appeared to criticize Israel’s actions.

“It is absolutely unacceptable to create threats to the lives and security of Russian servicemen who are in Syria at the invitation of its legitimate government to assist in the fight against terrorists,” Russia’s foreign ministry said.

Israel has long complained about the involvement of archenemy Iran, and Iranian proxy Hezbollah, in the Syria war. Both have sent forces to back Assad, who appears headed toward victory after years of fighting. Israel has said it will not accept a permanent military presence by Iran and its Shiite allies in Syria, especially near the Israeli border.

Israel has shot down several drones that previously tried to infiltrate its territory from Syria. The capture of an Iranian drone and the targeting of Iranian sites in response, however, marked a dramatic escalation in the Israeli retaliation. The military confirmed that the initial target in Syria — the unmanned aircraft’s launch components — was successfully destroyed and released grainy footage of the strike. Israel also said it had recovered the remnants of the drone, which proved that it belonged to Iran.

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El Deeb reported from Beirut. Associated Press writers Zeina Karam in Beirut, Albert Aji in Damascus and Amir Vahdat in Tehran contributed to this report.