A mass grave has been uncovered at a hospital in the southern Gaza city of Khan Younis, Gaza Civil Defense workers said, following the withdrawal of Israeli forces from the area earlier this month. CNN’s Nada Bashir has more.A mass grave has been uncovered at a hospital in the southern Gaza city of Khan Younis, Gaza Civil Defense workers said, following the withdrawal of Israeli forces from the area earlier this month. CNN’s Nada Bashir has more.