A new report by Human Rights Watch finds Egypt’s killing of at least 817 unarmed protesters in a single day last year was a premeditated attack that likely amounted to a crime against humanity. A year ago this week, Egyptian forces dispersed the Rabaa al-Adawiya sit-in as part of a systematic crackdown on protesters opposed to the ouster of President Mohamed Morsi. Human Rights Watch Executive Director Kenneth Roth and Middle East Director Sarah Leah Whitson had attempted to enter Egypt to present the report, but they were detained and turned away.