An Israeli airstrike reduces a nine-story apartment building in Beirut’s southern suburb to a large mound of rubble. A man covered in dust flails lifelessly in the arms of a plainclothes rescuer. A corpse in a body bag is whizzed past parked ambulances on the back of a quad bike.

Israel and Hezbollah accelerated their cross-border attacks overnight into Sunday, in a rapidly deteriorating situation that has the adversaries as close to full-out war as they have been in their nearly yearlong conflict.