- Iraqi forces had launched an attack on the town Saturday
- Special investigators are being sent to site of the grave, at an agricultural school
Irbil, Iraq (CNN)A mass grave containing the remains of about 100 beheaded civilians has been discovered inside a school in a town south of Mosul, Iraq's military said in a statement Monday.
Tens of thousands displaced
Peshmerga assault on Bashiqa
CNN's Mohammed Tawfeeq reported from Irbil, Iraq, and Tim Hume reported and wrote from London. CNN's Deborah Bloom contributed to this report.