Mass graves with hundreds of bodies were discovered last weekend at Nasser Hospital in Khan Younis and Al-Shifa Hospital in Gaza City, prompting serious concerns about war crimes, according to the OHCHR, the U.N.’s human rights office. [time-brightcove not-tgx=”true”] Much remains unknown about the victims, but the discovery of the bodies comes after Israeli troops ended their two-week operation at Al-Shifa Hospital in early April.