Aid charity World Central Kitchen (WCK) has demanded an independent commission to investigate the killings of its staff in an Israeli air strike in Gaza, saying the Israeli military could not credibly investigate its own “failure”, Reuters reports.

“Without systemic change, there will be more military failures, more apologies and more grieving families,” according to a statement published by WCK.

Israel has said that its inquiry into the incident has found serious errors and breaches of procedure by its military. Two senior officers have been dismissed and senior commanders formally reprimanded, it said.

WCK said the action taken by Israel represented “important steps ahead” but said it is also clear from the preliminary investigation that the Israeli military has deployed deadly force without regard to its own protocols, chain of command and rules of engagement.