The Israel Defense Forces said its troops are “highly prepared for any scenario,” after Hamas reported the death of Saleh Arouri, one of its senior leaders, in a blast in a Beirut suburb. Hezbollah, an Iranian-backed militant group based in Lebanon, blamed Israel and said the strike will not pass “without a response and punishment.” The Lebanese government said it was urging Hezbollah to show restraint as the group’s leader, Hasan Nasrallah, was expected to give a speech Wednesday.