Excavators searching for remains of victims of the Tulsa Race Massacre have discovered of 59 graves and seven sets of exhumed remains.

Oklahoma’s State Archaeologist Kary Stackelbeck and crew completed an excavation that began Sept. 5 on Friday (Sept. 29). She said investigators were searching for the wooden boxes in which the seven sets of remains were found based on their description in newspaper articles, funeral records and death certificates.

"For all of those seven individuals that we've exhumed up to this point in time, those individuals have been transported to our onsite forensic laboratory," Stackelbeck said, per CBS News.

Of the 59 unmarked graves discovered, 57 were previously unknown. Two previous excavations revealed 66 sets of remains.

The remains will be reburied in their original grave sites once the forensic analysis is complete and any recoverable DNA will be sent to a forensic lab in Salt Lake City.

The Tulsa Race Massacre, also known as Black Wall Street Massacre, saw as many as 300 Black people murdered in 1921 at the hands of a white mob that invaded Greenwood, a prosperous Black section of Tulsa. More than 1,000 homes and businesses were burned down.

The three known survivors of the massacre, Lessie Benningfield Randle, Viola Fletcher and Hughes Van Ellis, sued the City of Tulsa and other defendants for reparations. The Oklahoma Supreme Court will consider the case after a lower court dismissed it in July.