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.

Israeli jets Sunday launched an airstrike over a southern Lebanese border village, while troops shelled other border towns and villages still under Israeli control, Lebanon’s state-run National News Agency reported.

Hezbollah has claimed the first strike against Israel since a US-backed cease-fire plan came into effect less than a week ago, prompting Israeli officials to vow a strong response in the most serious threat so far to the truce with Lebanon.