Kate Carlton Greer

Twenty years after the Oklahoma City bombing, nearly one in four survivors has markers for PTSD. Counselors are still opening up new cases for first responders as a result of the bombing.

The University of Oklahoma student seen in a video leading the fraternity in a racist chant has publicly apologized. Levi Pettit met with black clergy and other community members to say he was wrong.

Sigma Alpha Epsilon members have until midnight Tuesday to leave their fraternity's campus house after a video surfaced showing several members singing derogatory racial language.

One of America's largest college fraternities, Sigma Alpha Epsilon, closed its chapter at the University of Oklahoma late Sunday after a video posted hours earlier appeared to show fraternity members singing a racist chant. Please note that this report uses some harsh, racial language.