An Israeli airstrike slammed into a densely populated residential area in Lebanon’s capital near key government and diplomatic buildings late Monday, killing at least five people as the U.S. pressed ahead with cease-fire efforts.

The Hezbollah militant group has a strong presence in central Beirut, known as the Dahiyeh, and the strikes came as Lebanese officials are considering a U.S.-brokered cease-fire proposal.

Israel killed Hezbollah’s chief spokesman in a rare central Beirut airstrike. An anonymous Hezbollah official confirmed the death of Mohammed Afif to the Associated Press, while two Lebanese security sources confirmed it to Reuters.