Human Rights Watch says Israel has not shown it will conduct objective probe . Group also faults its reporting on Gaza conflict , which it is still reviewing . ` There is absolutely no symmetry or proportionality between the occupying power and the occupied people '' wrote Riyad Mansour , Palestinian ambassador to the United Nations . Both sides are reporting on alleged war crimes during Gaza war a year ago . About 40 Palestinians and 13 soldiers were killed during the Israeli incursion .
Human Rights Watch says Israel has not shown it will conduct objective probe . Group also faults its reporting on Gaza conflict , which it is still reviewing . Both sides are reporting on alleged war crimes during Gaza war a year ago . About 40 Palestinians and 13 soldiers were killed during the Israeli incursion .