Between 1831 and 1996, Canada's residential school system forcibly separated indigenous children from their families.
In a statement quoted by several Canadian media, including CBC and CTV, the native Cowessess community said it had made "the horrific and shocking discovery of hundreds of unmarked graves" during excavations at former Marieval boarding school.
Manitoba notes that First Nation, Metis, and Inuit children would have attended at least one of the 17 residential schools in the province, 14 of which are officially recognized by the Indian Residential School Settlement Agreement.
However the group did not specify the exact number of graves found.
Cowessess First Nation is scheduled to make an official announcement and provide more details Thursday morning.
Unmarked graves were found near a former Catholic residential school for indigenous children in Saskatchewan, Canada, according to The Washington Post.
Saskatchewan Premier Scott Moe said he understood that many of those discovered in unmarked graves at Marieval were children, and it was "heartbreaking" to think that they had lost their lives after being separated from their families.
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MKO Grand Chief Garrison Settee said in the news release that the last few weeks have been hard for residential school survivors and their descendants due to the discovery of these unmarked graves.
From 1883 to 1996, almost 150,000 Indigenous children were separated from their families, often by force, and sent to the government-funded, church-run schools in an attempt to assimilate them.
Communities or organizations can submit a research proposal for a single residential school site to receive a maximum of $150,000.
"I urge all Canadians to stand with First Nations in this extremely hard and emotional time", he posted on Twitter Wednesday evening.
They were malnourished and physically and sexually abused in what the country's Truth and Reconciliation Commission called "cultural genocide" in 2015.