Nearly 100 years after a deadly race massacre, Tulsa began searching for evidence that victims of one of the country’s worst episodes of racial violence were buried in mass graves.

On Monday, scientists and forensic anthropologists armed with ground-penetrating radar combed the grounds of Tulsa’s Oaklawn Cemetery, looking for anomalies that might be consistent with mass graves.

The cemetery, which is owned by the city, is just a few blocks from what is known as Black Wall Street. It is also the site where, in 1999, renowned forensic anthropologist Clyde Snow led a team of scientists who discovered an anomaly bearing “all the characteristics of a dug pit or trench with vertical walls and an undefined object within the approximate center of the feature,” the Tulsa Race Riot Commission concluded in its 2001 report.

Along with testimony from a witness of the massacre, the report said, “this trench-like feature takes on the properties of a mass grave.” The commission recommended excavation, but the city decided not to dig for physical evidence.

Last year, Mayor G.T. Bynum (R) announced that he would reopen the investigation into mass graves, calling it a murder investigation. The announcement followed a Washington Post story about the unresolved questions surrounding the massacre.

“We owe it to the community to determine if there are mass graves in our city,” Bynum told The Post at the time. “We owe it to the victims and their family members.”

The city is obligated to find out what happened in 1921 as Tulsa prepares to mark the 100th anniversary of the rampage, he said.

“If you get murdered in Tulsa, we have a contract with you that we will do everything we can to find out what happened and render justice,” he said. “That’s why we are treating this as a homicide investigation for Tulsans who we believe were murdered in 1921.”

For decades, few people in Tulsa spoke about the massacre, which began May 31, 1921, when a white mob descended on Greenwood, a prosperous business district often called Black Wall Street.

In 48 hours, the mob burned hundreds of black-owned businesses and homes. Historians believe as many as 300 black people were killed and 10,000 were left homeless. Witnesses recounted seeing men, women and children shot, some while trying to escape burning houses.

Survivors also described seeing bodies tossed into mass graves.

The city said in a statement that it would use ground-penetrating radar to investigate Oaklawn Cemetery, Newblock Park, and Rolling Oaks Memorial Gardens, which was once known as Booker T. Washington Cemetery.

Deputy Mayor Amy Brown said the city had established a public oversight committee to oversee the investigation. It is made up of historians and scholars, including Scott Ellsworth, author of “Death in a Promised Land: The Tulsa Race Riot of 1921.”

The investigation team consists of archaeological geophysicists and archaeologists. The city hopes to finish the ground-penetration radar investigation by December or January.

If the city finds evidence of mass graves, city officials and the oversight committee will decide whether to excavate. The Oklahoma medical examiner’s office would lead the investigation into determining the cause of death.

“The cause of death determination would be an important step in the investigation as remains will be close to 100 years old and a Spanish influenza outbreak occurred in Tulsa in 1919 prior to the race massacre in 1921,” the city said in a statement.

If there are mass graves linked to the massacre, the city plans to work with the oversight committee to decide the “next steps as it relates to storing remains, DNA testing and genealogical research, and commemorating the grave sites and honoring the remains.”

On Monday, Kristi Williams, an activist and oversight committee member, watched as the radar investigation in Oaklawn Cemetery got underway. “We want full transparency, reparations and justice,” she said.

Tulsa City Councilor Vanessa Hall-Harper was also on site for the start of the investigation, which she repeatedly demanded.

“I hope they find what we know is there,” Hall-Harper said. “I hope they find the mass graves. We know hundreds of people, perhaps thousands, were murdered. Something was done with their bodies. We hope to get to the truth of where some victims of the massacre were dumped, and ultimately, we will lay them to rest.”

An earlier version of this story did not make it clear that historians believe as many as 300 people were killed in 1921 — the exact number is not known — and that it was witnesses who recounted seeing people shot.

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