Editor's note: This story contains graphic descriptions of injuries.

AMMAN, Jordan — When Zain Abu Obeid died on Sunday at the last functioning hospital in Rafah, there was no one to collect the 7-year-old boy's body from the morgue. He had been injured in an Israeli airstrike that killed his entire family, according to members of a U.S. medical team trapped at the European Hospital following Israel's closure of the nearby border crossing.