Prime Minister Benjamin Netanyahu called Hezbollah firing on a military site around the contested border was a "serious violation" of the ceasefire, and said Israel would "respond strongly."

Hezbollah fired Monday evening at an Israeli Army post in a south Lebanon border area in a first such response to alleged repeated Israeli violations of a cease-fire agreement achieved last week.

Both sides have accused each other of violating the deal; Hezbollah fired into Israel for the first time since the truce took effect, and Israel responded with airstrikes.