Human Rights Watch has found Israel committed war crimes by attacking schools where displaced residents were sheltering in Gaza. The report looked at three attacks on U.N.-run shelters this summer which killed at least 45 people, 17 of them children. It came a day after Israel said it had opened criminal probes into two of the most publicized killings of Palestinian civilians during this summer’s assault, including one of the school attacks. But Human Rights Watch noted “Israel has a long record of failing to undertake credible investigations into alleged war crimes.”