The IDF said Thursday it was sending additional troops to reinforce the northern border with Lebanon after the Hezbollah terror group threatened retaliation after one of its fighters was killed in Syria in an alleged Israeli air attack.
Today's exchange of fire took place in the contested Mount Dov, also known as Shebaa Farms - an area Israel, Lebanon and Syria each claim as its own. Reinforcements were surged to the frontier last week after Israeli warplanes killed a Hezbollah fighter in Damascus, Syria, an act that the militants promised to avenge.
Lt Col Jonathan Conricus, an army spokesman, said there had been no Israeli military casualties but "the event" was continuing.
Israel and Hezbollah last engaged in open war along the border in 2006, with the month-long conflict killing more than 1,100 Lebanese and 165 Israelis.
Israeli soldiers are shown Monday in front of an Iron Dome defence system battery, created to intercept and destroy incoming short-range rockets and artillery shells, in the Hula Vally in northern Israel near the border with Lebanon.
Israel has carried out scores of airstrikes in Syria in recent years targeting Iranian forces there, and has targeted what Israel says are weapons shipments bound for Hezbollah in Lebanon.
"Lebanon and Hezbollah will bear the responsibility for any attack from Lebanese territory", Israeli Prime Minister Benjamin Netanyahu said in broadcast remarks, shortly before the reports of the incident. It captured the Golan Heights from Syria in the 1967 Middle East war.
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Over the weekend, Israel sent a message via the United Nations to the Lebanese government, warning that any action from Lebanese soil against Israel would be considered a severe border violation and Israel would retaliate in kind.
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Hezbollah dismissed the Israeli claims about "purported skirmishes" in a media statement issued around 7pm Beirut time. Our policy is clear: "We will not allow Iran to gain a military position on our borders with Syria".
"The IDF is prepared for any scenario".
The Hezbollah-backed government of Lebanese Prime Minister Hassan Diab is also being harshly criticized for doing too little to try to get Lebanon out of its worst economic and financial crisis in decades. "We operate in all the arenas for Israel's defence - close to our borders and far from our borders".
The Hezbollah statement said its fighters had not been involved in any clash, shooting or infiltration on Monday, saying "it was only one party, which was the fearful, anxious and tense enemy".