Renewed cross-border fire comes despite last week's ceasefire.
The ceasefire in Lebanon is holding despite ongoing Israeli airstrikes on Hezbollah targets, which Israeli officials say are responses to ceasefire violations by the Iranian-backed militant group.
The Israel Defense Forces continues its intense airstrike and ground campaigns in Gaza, particularly in the north of the devastated Palestinian territory.
Tensions also remain high between Israel and Iran after tit-for-tat long-range strikes in recent months and threats of further military action from both sides.
The IDF said it is striking targets in southern Lebanon on Monday after Hezbollah officials said earlier they fired on an Israeli target.
“We will respond decisively to Hezbollah’s severe violation of the ceasefire —and will continue to do so. We have plans and targets ready to be carried out and at any given moment," the Chief of the General Staff, LTG Herzi Halevi, said Monday.
Hezbollah officials said Monday they fired on an Israeli target in southern Lebanon, accusing Israel of “repeated violations” of the ceasefire agreement.
The Israel Defense Forces said Hezbollah launched two projectiles toward the area of Har Dov. There were no injuries, with the projectiles falling in open space, the IDF said.
Israeli Prime Minister Benjamin Netanyahu threatened a forceful response, calling it a "serious violation of the ceasefire."
"We are determined to continue enforcing the ceasefire, and to respond to any violation by Hezbollah -- minor or serious," Netanyahu said.
The family of Omer Maxim Neutra, the Israeli-American soldier who had been believed to be in Hamas captivity, released a statement Monday after it was confirmed he was killed Oct. 7.
"Our hearts are shattered with this devastating news," the family said. "The Neutra family is deeply grieving and are requesting the public, who has shown great support throughout this journey, to please respect their privacy until they are formally ready to announce the next steps."
"May Omer’s memory be a blessing," they added.
Israeli Prime Minister Benjamin Netanyahu and his wife, Sara Netanyahu, said in a joint statement Monday they "will not rest or be silent" until the body of killed U.S.-Israeli soldier Omer Neutra is recovered from the Gaza Strip.
The Israel Defense Forces confirmed Monday that Neutra, 21, was killed during Hamas' Oct. 7, 2023, attack into southern Israel and his body taken back into Gaza. Neutra -- who was originally from New York -- was previously thought to have been taken hostage. He was serving as a tank platoon commander at the time of the attack.
Neutra "fought fiercely at the head of his soldiers to defend the settlements surrounding Gaza, until he fell." Netanyahu's statement said. "We share in the family's heavy grief," it added.
"We will continue to act resolutely and tirelessly until we return all of our captives -- the living and the dead," the statement said.
There are still three American citizens thought to be alive as hostages inside Gaza.
-ABC News' Jordana Miller and Joe Simonetti
