Hezbollah's Leader Pledges Revenge for Killing of a Hamas Leader in Beirut

Just 24 hours before he took to the podium on Wednesday, Hassan Nasrallah, the head of Lebanon's powerful armed group Hezbollah, was preparing to deliver a speech commemorating another of Israel's former arch foes, Qassem Soleimani, the Iranian commander killed in a U.S. drone strike four years ago to the day. But in the wake of the suspected Israeli assassination on Tuesday of Saleh al-Arouri, a top Hamas leader killed in the heart of Hezbollah's stronghold in southern Beirut, Mr. Nasrallah revised his comments to commemorate not just one of his closest allies, but two. In a highly anticipated speech on Wednesday that gained new significance in the wake of Mr. al-Arouri's assassination, Hezbollah's leader denounced the attack in Lebanon's capital as a "dangerous" milestone, pledging revenge for the killing and threatening to meet any wider Israeli conflict with unrestrained warfare. "If the enemy considers waging a war against Lebanon, our battle will be without boundaries or rules," Mr. Nasrallah said. "We are not afraid of war. Those who think of going to war with us will regret it. War with us will come at a very, very, very high cost."