AP documents 72 mass graves found so far from IS territory
![AP documents 72 mass graves found so far from IS territory](http://bloximages.chicago2.vip.townnews.com/tdn.com/content/tncms/assets/v3/editorial/a/63/a6372edf-313f-500b-9809-fc33878a726d/57c52b9e46a7f.image.jpg?resize=300%2C199)
HARDAN, Iraq (AP) — Peering through binoculars, the young man watched as Islamic State extremists gunned down the handcuffed men and then buried them with a waiting bulldozer. For six days he watched as IS filled one grave after another…