The security sources identified him as Wissam al-Tawil, the deputy head of a unit within the Radwan force.
They said he and another Hezbollah terrorist were killed when their car was hit in a strike on the Lebanese village of Majdal Selm.
“This is a very painful strike,” one of the security sources said. Another said, “things will flare up now.”
Israeli bombardment has killed more than 130 Hezbollah terrorists in southern Lebanon since cross-border shelling began in the aftermath of Hamas’s attack on Israeli territory on Oct. 7.
Another 19 have been killed in Syria.
Hezbollah’s secretary-general Sayyed Hassan Nasrallah warned Israel in two televised addresses last week not to launch a full-scale war on Lebanon.
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“Whoever thinks of war with us — in one word, he will regret it,” Nasrallah said.