UN rights chief ‘horrified’ by mass grave reports at Gaza hospitals BBC.comEU urges probe into Palestinian claim of mass graves at Gaza hospitals The Times of IsraelIsrael’s war on Gaza live: Demands for mass grave investigation grow | Israel War on Gaza News Al Jazeera EnglishIsraeli troops storm back into eastern Khan Younis ReutersEU, UN call for probe into reported mass graves at Gaza hospitals Yahoo! Voices