WARNING: Video contains content that may be disturbing to viewers. Discretion is advised. An investigation is underway into a disturbing discovery in Ukraine. Local authorities say they have found hundreds of graves in an area recently retaken from Russia. The mass burial site is in a forest just outside of Izium, which was invaded in the early days of the war and used by Russia as a key military hub. Eric Sorensen has more on the discovery and what it could mean for the conflict.