Israel Air Force fighter jets struck a Hezbollah terror fire and defense array near the Beaufort Ridge in south Lebanon on Friday morning, the military confirmed.
The site was part of a "significant underground project," the IDF noted, adding that it was "completely taken out" by the strikes.
The simultaneous strikes hit a mountainous strip near the southern Lebanese city of Nabatieh, according to the Lebanese security sources, who said Hezbollah likely still had arms depots there. There was no immediate comment from the group.
The IDF struck because it identified "rehabilitation attempts" made by Hezbollah terrorists to use the underground facility.
The IDF later said, following an investigation, that as a result of its strike, a Hezbollah rocket that was stored at the site was launched and hit a civilian building.
"The IDF will not allow attempts made by Hezbollah to operate at the site and will continue to operate to eliminate any threat against the State of Israel," they added.
More than a dozen Israeli air strikes battered a row of hilltops in southern Lebanon, security sources said.
The IDF said its fighter jets had attacked a site used to manage Hezbollah's "fire and defense system." It said the site was destroyed in last year's war but that Hezbollah was attempting to resume activities there in breach of the November truce that ended the conflict.
Accusations IDF is violating US-brokered ceasefire
Lebanon's President Joseph Aoun on Friday fired the same accusation back at Israel, saying it was continually violating the US-brokered ceasefire deal by keeping up strikes on Lebanon.
The ceasefire deal stipulates that southern Lebanon must be free of any non-state arms or terrorists, Israeli troops must leave southern Lebanon as Lebanese troops deploy there, and all fire across the Lebanese-Israeli border must stop.
Israeli troops remain in at least five posts within Lebanese territory, and its air force regularly kills rank-and-file Hezbollah members or people affiliated with the group.