Israel launched an airstrike on Beirut early Friday in the first attack on the Lebanese capital since the ceasefire between Israel and Hezbollah

Israel launched an airstrike on Beirut for the first time since a U.S.-backed cease-fire took effect in November, amid growing frustrations among some American officials about the Lebanese government’s slow progress in disarming Hezbollah in the country’s south.

The Israel-Hezbollah conflict boiled over into all-out war in September as Israel carried out waves of airstrikes and killed most of the militant group’s senior leaders. The fighting killed over 4,000 people in Lebanon and displaced about 60,000 Israelis.