Global leaders expressed shock and grief over an incident in which Gaza health officials said more than 100 people were killed after a crowd converged on an aid convoy in Gaza City, and connected the event to the dire humanitarian situation in the territory. Josep Borrell, the top E.U. diplomat, said he was “horrified by news of yet another carnage among civilians in Gaza desperate for humanitarian aid.” Palestinian and Israeli officials exchanged blame for the incident, which President Biden said will complicate hostage negotiations.