An Israeli airstrike destroyed on Monday another bridge on the Litai River in southern Lebanon.
The strike on the bridge in the southern village of Qaaqaaiyet al-Jisr cut a main link between the southern city of Nabatieh and al-Hujair valley region farther south.
The state-run National News Agency gave no further details.
On Sunday, Israel struck the Qasmiyeh bridge near the southern port city of Tyre.
Lebanese President Joseph Aoun called Israel’s new targeting of bridges in the south “a prelude to a ground invasion.”
The Israeli military announced Sunday it was expanding its ground campaign against Hezbollah in Lebanon, warning of a lengthy operation, after Beirut condemned what it called Israel's flagrant violations of Lebanese sovereignty.
Israeli forces were ordered earlier Sunday to destroy bridges they said were used by the Iran-backed group Hezbollah to cross the Litani River.
"The operation against the Hezbollah terrorist organization has only begun... This is a prolonged operation," Lieutenant General Eyal Zamir said in a statement.
"We are now preparing to advance the targeted ground operations and strikes according to an organized plan," he added.
In a separate statement Sunday, military spokesman Brigadier General Effie Defrin said the expansion of the ground operation would begin within the coming week.
Lebanon was pulled into the Middle East war when Hezbollah began firing rockets into Israel on March 2 to avenge the killing of Iran's supreme leader Ali Khamenei in an Israeli-US strike.
Lebanon's health ministry said four people were killed on Sunday in two strikes in the south, while authorities have reported 1,029 dead in three weeks of conflict and more than one million displaced.
Israeli Defense Minister Israel Katz said he and Israeli Prime Minister Benjamin Netanyahu had instructed the military "to immediately destroy all the bridges over the Litani River that are used for terrorist activity, in order to prevent Hezbollah terrorists and weapons from moving south".
The Litani River runs around 30 kilometers (20 miles) north of the Israeli border.
Earlier this week, Israel attacked two bridges spanning the Litani, also alleging they were being used by Hezbollah.
Katz said the military was also instructed to "accelerate the demolition of Lebanese houses in the contact villages in order to thwart threats to Israeli communities".
