Video: Mass grave discovered in former 'Islamic State'-held territory

Iraqi investigators are probing a mass grave that was discovered by troops advancing further into Islamic State-held territory near the city of Mosul.

Iraqi investigators are probing a mass grave that was discovered by troops advancing further into territory previously held by the so-called 'Islamic State' group near the city of Mosul.

The chilling find was the latest instance of mass graves being uncovered on ground wrested from 'IS' militants.