The Israel Defense Forces on Tuesday took responsibility for a strike on a refugee camp in northern Gaza that Palestinian health authorities said killed or injured hundreds. Fighting has put the hospital system in the enclave on the verge of collapse as casualties pile up and supplies fall short. The Hamas border authority said Egypt had agreed to take in 81 injured people on Wednesday, though such deals have fallen through before. Palestinian officials later released the names of 400 people who may be allowed to enter Egypt from Gaza through the Rafah crossing starting Wednesday. Secretary of State Antony Blinken will visit Israel this week, a State Department spokesman said Tuesday — the top U.S. diplomat’s second trip there since the war began on Oct. 7.