A rare Israeli airstrike on central Beirut killed Hezbollah's chief spokesman on Sunday, an official with the militant group said. Earlier, officials said Israeli strikes killed at least 12 people in the Gaza Strip,

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.

An Israeli strike on a building in a densely populated district of Beirut on Sunday killed Hezbollah's media relations chief Mohammad Afif, two Lebanese security sources told Reuters, though there was no immediate confirmation from Hezbollah.