A wave of Israeli strikes across Gaza on Sunday hit a hospital and other sites, killing at least 21 people, including children, as Israel vowed to expand its security presence in the small coastal strip. The predawn strike on Al-Ahli Hospital in Gaza City was the latest of several attacks on northern Gaza’s last major hospital providing critical health care. Hospital director Dr. Fadel Naim said the emergency room, pharmacy and surrounding buildings were severely damaged, affecting over 100 patients and dozens of staff. One patient, a girl, died during the evacuation following an Israeli warning because staff were unable...