ISIS releases video of their biggest massacre - prisoners made to lay in mass graves before being shot dead

This has to be their one of their sickest videos yet. ISIS over the weekend released a video showing the mass executions of prisoners. The men -  in their hundreds - were made to lay in shallow graves and were then sprayed with bullets. The men are believed to be military cadets captured during their battle with the terrorists.

The men were brought to their death place in trucks and were heard in the video pleading for their lives before they were machine-gunned. Some were shot individually and their bodies dumped into the Tigris River, while an excavator is seen shifting piles of bodies as the executions continue into the night. More photos after the cut...