Iraq Begins Excavating IS Mass Grave Near Mosul

Imagine a large pit near Mosul, Iraq, where a dangerous group called IS buried many people.

Now, Iraqi officials are carefully digging up the bodies to find out who they were and give them a proper burial.

They're starting slowly by collecting what they can see on the surface and preparing to collect DNA.

The process is tricky because the ground is hard to work in, and there might be dangerous materials.

They believe many people were buried there, including soldiers, police officers, and members of a religious group called Yazidi.