Gaza is becoming a "graveyard for children", U.N. Secretary General Antonio Guterres said on Monday, amplifying demands for a ceasefire in the enclave, where Palestinian health authorities said the death toll from Israeli strikes had exceeded 10,000. Both Israel and the Hamas militants who control Gaza have rebuffed mounting international pressure for a ceasefire. Israel says hostages taken by Hamas during its rampage in southern Israel on Oct. 7 should be released first; Hamas says it will not free them or stop fighting while Gaza is under assault.