The bodies of six foreign aid workers killed in an Israeli strike were on Wednesday taken out of Gaza to Egypt for repatriation, a security source said, as Israel faced a chorus of outrage over their deaths, AFP reports.

The Israeli military killed seven staff of the US-based food charity World Central Kitchen on Monday in an attack that UN chief Antonio Guterres labelled “unconscionable” and “an inevitable result of the way the war is being conducted”.

The remains of the six international staff, who were killed alongside one Palestinian colleague, were taken in ambulances to the Rafah crossing to Egypt, where they were handed over to representatives of their respective countries, the security source said on condition of anonymity.

Israel’s armed forces chief Herzi Halevi called the attack a “grave mistake”, which he blamed on night-time “misidentification”, adding in a video message that “we are sorry for the unintentional harm to the members of WCK”.

Israeli Prime Minister Benjamin Netanyahu pledged the “tragic case” would be investigated “right to the end”, and President Isaac Herzog expressed his “deep sorrow and sincere apologies”.