United Nations investigators say there is already clear evidence of possible war crimes in both Israel and the Gaza Strip. They have been gathering and preserving evidence since Saturday and the launch of the Hamas offensive against Israel. Those who violated international law and targeted civilians must answer for their crimes , said the three members of the International Commission of Inquiry on Israel and the Palestinian Territories in Geneva on Tuesday. They called for the unconditional release of Israeli hostages and recalled that the detention of civilians constitutes a war crime. The commission is also concerned by the Israeli raids and the announcement of a total siege. Like the UN before it, it explains that the deprivation of electricity, food, water or medical care without military justification constitutes collective punishment . It calls on the parties to the conflict to put an end to the violence and uphold international law. How we work This news story has been written a