JERUSALEM, Undefined (AFP) — Air raid sirens sounded in Israel on Sunday as its military worked to intercept barrages of incoming Iranian missiles for the first time since an April ceasefire took hold in the Middle East war.

Iran’s powerful Revolutionary Guards called the attack a “warning” after Israel struck Beirut’s southern suburbs earlier in the day, threatening wider strikes in the event of repeated aggression.

An April 8 ceasefire had halted major hostilities between Iran, Israel and the United States, but efforts to turn the truce into a settlement have repeatedly stalled, and Sunday’s launches were sure to further dampen hopes for a lasting peace, as the Middle East war reached its 100th day.