An airstrike has leveled an apartment building and killed three Palestinian militants in central Beirut, as Israel appeared to send a clear message that no part of Lebanon is out of bounds.

The first apparent Israeli airstrike on central Beirut in nearly a year of conflict leveled an apartment building early Monday. It came after Israel hit targets across Lebanon and killed dozens of people,

Hamas' leader in Lebanon is the latest Palestinian militant group commander killed there by Israeli airstrikes in recent days, including Hezbollah's longtime chief, Hassan Nasrallah.