Iran’s foreign minister has already arrived in the country, state media reported. He was believed to be carrying a written response to a U.S. proposal to end the war.

The U.S.-mediated cease-fire halted an all-out war between Israel and Hezbollah, but their intensifying attacks on each other could put the truce at risk.

The decision by Lebanon’s foreign ministry has heightened fears of internal instability. Hezbollah, the Iranian-backed militant group and political party, was quick to condemn the move.

A 4-year-old, a professor and an aid worker are among those killed in separate airstrikes as Israel pummels towns and cities, saying it is targeting Hezbollah operatives.

The 90-mile waterway, back in focus amid Israel’s renewed offensive in Lebanon, could define how far the fighting spreads.

Mass evacuation orders and an intensifying Israeli bombing campaign targeting the Iran-backed militia Hezbollah have caused a humanitarian crisis, aid groups warn.