By FADI TAWIL, BASSEM MROUE and NATALIE MELZER BEIRUT (AP) — A rare Israeli airstrike on central Beirut killed Hezbollah’s chief spokesman on Sunday, an official with the militant group said. Earlier, Israeli strikes killed at least 12 people in the Gaza Strip, officials said, where Israel has been at war with the Palestinian Hamas for over a year. The latest in a series of targeted killings of senior Hezbollah officials came as Lebanese officials were considering a United States-led cease-fire proposal.