The graves of 145 people were discovered under a high school in Tampa, in the US state of Florida.
They are part of Ridgewood Cemetery, a mid-20th Century cemetery for the poor.
– buried 3-5ft (1-1.5m) deep – was discovered using sharp radar after the school was alerted about the possible location of the cemetery.
Records indicate that more than 250 people were buried there, most of them African Americans, the school district said.
Up to 77 of them were infants or toddlers.
The city opened Ridgewood in 1942 and sold it to a private company in 1957. The school district acquired the land in 1959. opening of King High School in 1960.
Today, the site consists of open school land and agricultural buildings.
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Plans are being made to have the building "removed, according to school district Superintendent Jeff Eakins.
" We want to make sure people buried on this site are honored, "he said.
While the radar used was not confirm what exactly is beneath the surface, the patterns of the findings that correspond to the historical records of the cemetery.
As regards graves that have not been accounted for, some may have been moved or not taken by radar because they were damaged or, in the case of children, their small size.
"I'm sick of it. It hurts deeply, "Yvette Lewis, president of the local branch of the National Association for the Advancement of Color, was quoted as saying by the Tampa Bay Times.
" It's outrageous to people like me. I'm so sad that people can hate you so much, that they can treat you less. "