As many as 300 Black residents were killed during the Tulsa race massacre. Researchers conducted another excavation in July but found no evidence of human remains at the first site.

As many as 300 African American residents were slaughtered when white mobs descended on Tulsa's Greenwood district nearly a century ago. The lead plaintiff is a 105-year-old survivor of the massacre.

Tulsa officials have begun a test excavation to determine if land on city-owned Oaklawn Cemetery is the site of a mass grave of victims of the race massacre. Most of the victims have never been found.