Hezbollah said it hit a key Israeli observation post early on Saturday with 62 rockets as a "preliminary response" to the killing of Saleh al-Arouri, Hamas' deputy chief.
Al-Arouri was killed on Tuesday in an Israeli drone strike on Beirut's southern suburbs.
Hezbollah chief Hassan Nassallah said on Friday that being "silent" on the strike would allow all of Lebanon to be vulnerable to more attacks.
The Hezbollah statement on Saturday said the group had hit a main post on an elevated hilltop that Israel relied on for "aerial observation" and "air control.”
Lebanon’s national news agency reported of IDF strikes in the southern part of the country, alongside news outlet Al Mayadeen, affiliated with Hezbollah.