TULSA, Okla. (NewsNation Now) — The city of Tulsa is beginning a second excavation Monday to find and identify victims of the 1921 Race Massacre that left hundreds dead and destroyed an area that was once an affluent African American community.

The excavation and core sampling that’s part of Tulsa’s mass graves investigation will get underway at the Oaklawn Cemetery Monday at 9 a.m. EDT. Tulsa Mayor G.T. Bynum, the state’s archeologist, historians and other city officials will hold a news conference on the efforts at 1 p.m. EDT.

The second excavation comes nearly a century after a white mob attacked a thriving business district and residential area in Tulsa that was referred to as “Black Wall Street,” following exaggerated accounts circulating around the city about an incident between a young Black man and a white woman. From May 31 to June 1 of 1921, historians believe 300 people were killed and 800 more were injured, while white rioters robbed and burned businesses, homes and churches.

“People, they were just robbed, white people coming in saying Black people had better property than they had and that that was just not right,” Phoebe Stubblefield, a forensic anthropologist at the University of Florida and a descendant of a survivor of the massacre who is assisting the search, told The Associated Press. “Burning, thieving, killing wasn’t enough. They had to prevent Black people from recovering.”

The two locations to be searched are in Oaklawn Cemetery in north Tulsa, where a search for remains of victims ended without success in July, and near the Greenwood District where the massacre took place. The excavation is expected to take up to one week, city officials said.

The earlier excavation was done in an area identified by ground-penetrating radar scans as appearing to be a human-dug pit indicative of a mass grave. It turned out be a filled-in creek, said Mayor G.T. Bynum, who first proposed looking for victims of the violence in 2018 and later budgeted $100,000 to fund it after previous searches failed to find victims.

The massacre — which happened two years after what is known as the “Red Summer,” when hundreds of African Americans died at the hands of white mobs in violence around the U.S. —- has been depicted in recent HBO shows “Watchmen” and “Lovecraft County.”

It also received renewed attention after President Donald Trump selected Tulsa as the location for a June rally amid a national reckoning over police brutality and racial violence. Trump moved the date to avoid coinciding with a Juneteenth celebration in the Greenwood District commemorating the end of slavery.

Bynum, who is 43, said he didn’t learn of the massacre until about 20 years ago during the mayoral campaign of his uncle Bill LaFortune, and his grandparents confirmed the events.

“That’s a very common thing in Tulsa. That’s how you learned about it, not through books or the media or in school,” Bynum said. “People didn’t start talking about this event in Tulsa until about 20 years ago.”

Bodies, if discovered, will not be disturbed, Bynum said. The excavation would stop, and investigators would “do what they need to do to identify them and determine a cause of death,” Bynum said.

Efforts would also be made to find any descendants, a project that could prove difficult, according to Bynum.

“A hundred years after the fact, the descendants are scattered all around the world. Tracking down the descendants could take years,” Bynum said.

One site to be searched, known as the Original 18, is where old funeral home records indicate up to 18 Black people who were massacre victims were buried. The other site is where a man named Clyde Eddy said in the 1990s that, as a 10-year-old boy, he saw Black bodies being prepared for burial shortly after the massacre, but was told to leave the area.

Archaeologists have identified two additional possible sites, said state archaeologist Kary Stackelbeck, who is leading the investigation.

“We have multiple areas that we have identified as having merits for investigation,” based on the 2019 radar scans, Stackelbeck said. “We just have to ask for grace and patience” during the search.

The latest search is scheduled to last about a week, but could be extended, according to Stubblefield.

“I’m fully prepared to find human remains,” she said. “The questions are just whether they’re the remains we’re looking for.”

The city is providing a live video feed inside the cemetery while researchers are on site. It’ll be available on Tulsa’s website for the 1921 Graves Investigation.

The Associated Press contributed to this report.