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The organizations - Adalah, Association for Civil Rights in Israel, B'Tselem, Gisha, HaMoked, Physicians for Human Rights - Israel, Public Committee Against Torture in Israel, Rabbis for Human Rights, and Yesh Din - encouraged Israel's government to authorize such an investigation before the matter is turned over to international bodies.
The organizations' letter stresses that internal investigations by the IDF are an insufficient response, since these would only examine whether soldiers had violated orders, not whether the orders themselves constituted human rights violations.
The press release issued by the organizations can be read here.
The full letter to the Prime Minister is available here.