Eight of those killed came from the Palestinian Red Crescent. Five of the fatalities belonged to the civil defense, and one victim worked for a UN organization, the organization announced in a statement on Sunday.
The Israeli attacks took place in the Tal al-Sultan neighborhood in Rafah, near the border with Egypt, on March 23.
"The bodies could be recovered with difficulty as they were buried in the sand, some of the bodies had begun to decompose," the Red Crescent reports.
In an unusually sharp reaction from the International Federation of Red Cross and Red Crescent Societies (IFRC), the attack on ambulance personnel was condemned.
"Dedicated ambulance personnel worked to help injured people. They were humanitarians. They wore emblems that should have protected them, their ambulances were clearly marked. They should have been able to return to their families; they didn't get to," said IFRC Secretary General Jagan Chapagain in a statement.
On Saturday, the organization accused Israeli authorities of preventing it from retrieving the bodies.
Israel has confirmed that the military opened fire on the ambulances, and has previously claimed that "several Hamas terrorists were eliminated" in the attack.
