A U.S. envoy has arrived in Beirut to meet with Lebanese officials about a possible cease-fire in the Israel-Hezbollah war.

Israeli airstrikes targeted a neighborhood in the heart of Lebanon’s capital, slamming into an area of Beirut near the Parliament, several embassies and the U.N. headquarters

Lebanon and Hezbollah have agreed to a U.S. proposal for a ceasefire with Israel with some comments on the content, a top Lebanese official told Reuters on Monday, describing the effort as the most serious yet to end to the fighting.

Efforts for a ceasefire between Israel and Hezbollah have intensified, with a US envoy expected to return to Lebanon for talks over a possible deal, amid an escalation of Israel’s air attacks across the country.