For the Israeli Army to shoot unarmed Palestinians who posed no danger to anyone simply because they were in a zone declared off limits within Gaza is a war crime. Shooting unarmed civilian nurses is certainly a war crime:

“Article 24 of the 1949 Geneva Convention I provides:

Medical personnel exclusively engaged in the search for, or the collection, transport or treatment of the wounded or sick, or in the prevention of disease, staff exclusively engaged in the administration of medical units and establishments … shall be respected and protected in all circumstances.”

The practice has nevertheless been sanctioned by the Israeli Supreme Court, a stark illustration of the Israeli Establishment’s spiral down into a form of Central European fascism and supremacist ethnic nationalism.

The 1949 Geneva Conventions were enacted to prevent the recurrence of common practices of the Nazis in Europe.

via War Crimes: Israeli Snipers Kill Palestinian Nurse, Injure 100, at Gaza March of Return