The United Nation’s Human Rights Council said in a statement on Thursday that the Former UN human rights chief Navi Pillay will head an international commission of inquiry into alleged crimes committed during the latest conflict between Israel and the Islamist group Hamas in Gaza.

The council approved in late May to launch the investigation with a broad mandate to probe all alleged violations, not just in Gaza and the Israeli-occupied West Bank, but also in Israel during hostilities that were halted by a May 21 ceasefire.

At least 250 Palestinians and 13 people in Israel were killed in the fierce fighting, which saw Gaza militants fire rockets towards Israeli cities and Israel carry out air strikes across the coastal enclave.

Michelle Bachelet, the U.N. High Commissioner for Human Rights, told the council at the time that deadly Israeli strikes on Gaza might constitute war crimes and that Hamas had violated international humanitarian law by firing rockets into Israel.

Israel rejected the resolution adopted by the Geneva forum at an emergency special session and said it would not cooperate.

Pillay, a former South African judge who served as U.N. High Commissioner for Human Rights from 2008-2014, will lead the three-person panel also composed of Indian expert Miloon Kothari and Australian expert Chris Sidoti, said the statement issued by the Human Rights Council. The investigators, who have been tasked with trying to identify those responsible for violations with a view to ensure they are held accountable, are due to present their first report in June 2022.