Clashes between the Israeli military and Lebanon's Iranian-backed group Hezbollah flared Tuesday along a strategic river in Lebanon as Israeli troops tried to push farther north,

The fighting comes after overnight Israeli strikes killed at least 12 people in southern Lebanon and just three days before Lebanese and Israeli military delegations are set to meet for direct talks in Washington.

A previously reached cease-fire appeared more nominal by the day, complicating efforts at a broader peace in the Iran war, as Tehran wants an end to the fighting to include Lebanon.

The Litani River has been a de facto boundary in Lebanon, with large areas to the south under Israeli military control despite the Washington-brokered cease-fire in place for over a month.

Tuesday's intensified strikes and clashes came after Israeli Prime Minister Benjamin Netanyahu said he had authorized more intensive strikes targeting Hezbollah across Lebanon.