At least 18 people were killed, four of them children, and 60 more were wounded in the Israeli strike near the Rafik Hariri University Hospital late Monday, with the nationwide death toll for the day reaching 63, health authorities said. In Beirut, the strikes expanded into new neighborhoods for a second day, signaling the widening scope of Israel’s military ambitions against Hezbollah militants, even as U.S. officials toured the region talking up hopes of de-escalation.