BEIRUT— Israel warned today that it will keep striking Lebanon until militant group Hezbollah has been disarmed, hours after it hit south Beirut in what Lebanese leaders called a major violation of a November ceasefire.

An Israeli military evacuation call issued ahead of Thursday’s strikes sent huge numbers of residents of the southern suburbs of the Lebanese capital, long a bastion of Iran-backed Hezbollah, fleeing for their lives.

The attack on what the Israeli military said was Hezbollah’s underground drone factories came on the eve of Eid al-Adha, one of the main religious festivals of the Muslim calendar.

The strikes came around an hour after Israel’s military spokesman issued an evacuation call, and sent plumes of smoke billowing over Beirut.