Egyptian security forces intentionally killed at least 817 protesters during last August's Rabaa massacre, in a premeditated attack equal to or worse than China's Tiananmen Square killings in 1989, Human Rights Watch (HRW) has argued in a report. The 195-page investigation based on interviews with 122 survivors and witnesses has found Egypt's police and army "systematically and deliberately killed largely unarmed protesters on political grounds" in actions that "likely amounted to crimes against humanity".