One man says security force members shot , killed prisoners as ISIS fighters approached . Outside , fighters with the Islamic State in Iraq and Syria fired mortars at the anti-terrorism detention facility in Tal Afar , where fierce battles raged between the al Qaeda splinter group and Iraqi security forces . Comment: Amnesty International alleges that government forces , Shiite militias executed Sunni detainees . Human Rights Watch finds mass graves thought to hold those killed by ISIS fighters , their allies .
One man says security force members shot , killed prisoners as ISIS fighters approached . Comment: Amnesty International alleges that government forces , Shiite militias executed Sunni detainees . Human Rights Watch finds mass graves thought to hold those killed by ISIS fighters , their allies .