The Israeli military shot down an Iranian drone that infiltrated the country early today before launching a "large-scale attack" on at least a dozen Iranian and Syrian targets in Syria.
Israel called it a "severe and irregular violation of Israeli sovereignty" and warned of further action against the unprecedented Iranian aggression.
The military said its planes faced massive anti-aircraft fire from Syria that forced two pilots to abandon an F-16 jet that crashed in northern Israel. One pilot was seriously wounded and the other lightly.
The Israeli strikes marked its most significant engagement since the fighting in neighboring Syria began in 2011 and said Iran would be held responsible for its outcome.
"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."
Gen Hossein Salami, acting commander of Iran's Revolutionary Guard, did not acknowledge Israel's claim it shot down the drone. "We do not confirm any such news from Israel," he said.
Syria's Defense Ministry said in statements on its website that its air defenses responded successfully to the Israeli operation and hit more than one plane.
"The Israeli enemy has once again attacked some of our military bases in the southern area and our air defenses responded and foiled the aggression," it said.
Israel has mostly stayed out of the prolonged fighting in Syria, wary of being drawn into a war in which nearly all the parties are hostile toward it.
It has recently been warning of the increased Iranian presence along its border, but military spokesman Lt. Col. Jonathan Conricus said today's incident marked the most "blatant and severe violation of Israeli sovereignty" yet.
He said Israel has no interest in further escalation but that it would "extract a heavy price" for such aggression.
He said Iran was "playing with fire" by infiltrating Israeli airspace, and stressed that the unmanned aircraft Israel shot down was "on a military mission sent and operated by Iranian military forces." He said Israel recovered the dispatched drone, which was clearly Iranian.
In response, Conricus said Israeli jets destroyed the Iranian site in central Syria that launched it. Upon their return, the jets came under heavy Syrian anti-aircraft fire.
The pilots of one of the F-16s had to escape and the plane crashed. It's unclear whether the plane was actually struck or if the pilots abandoned their mission for a different reason.
Conricus said the Israeli jets faced between 15 to 20 anti-aircraft missiles fired by SA-5 and SA-17 batteries. All the Israeli jets in those sorties returned home safely.
The Syrian Observatory for Human Rights, which monitors the war in Syria, said Israel targeted the edges of a military air base, called T-4, in the Homs desert near Palmyra, where Iranian and Hezbollah forces are based alongside Syrian troops.
The Observatory said the raids resulted in casualties, but didn't specify. It also said Israeli raids targeted areas in southwestern Damascus, bordering the southern provinces. This was followed by raids on Syrian government posts along the Damascus-Beirut road, close to the border between Syria and Lebanon.
Syrian state TV said air defenses hit more than one Israeli plane and that a girl was injured when Israeli missiles fell near a school in a neighborhood in Damascus' countryside.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)