Indigenous leaders and residential school survivors in Canada have called on officials to conduct a thorough investigation of every former residential school in the country after the remains of the children were found.
"The number of unmarked graves will be the most significantly substantial to date in Canada", the Federation of Sovereign Indigenous Nations (FSIN) said in the advisory.
The communal gravesite was first used in 1885 and later taken over by the Marieval Indian Residential School, founded in 1899 by a Catholic group on what was then the Marieval Reserve, according to the National Post.
The province indicated its intention to find unmarked Indigenous graves last month, shortly after the discovery of the remains of 215 children at a mass grave near the former Kamloops Indian Residential School.More news: Russian Federation says it fired warning shots at United Kingdom ship
People hug in front of a makeshift memorial at former Kamloops Indian Residential School. The statement did not specify numbers.
"Today's announcement is an important one as it signals that Manitoba is willing to work with First Nations in taking the next steps to identify and locate our missing children", he said.
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.
"I urge all Canadians to stand with First Nations in this extremely hard and emotional time", he posted on Twitter Wednesday evening.More news: Covid-19: NI records 178 new cases and no further deaths
Many were subjected to ill-treatment and sexual abuse, and more than 4,000 died in the schools, according to a commission of inquiry that concluded Canada had committed "cultural genocide" against the indigenous communities. For much of that time, the Roman Catholic Church operated the school.
Canada's federal government apologised for the system in 2008.
Clark said he has attended the annual Cowesses First Nations Christmas supper for Saskatoon band members and seen the vibrancy and warmth of the community.More news: Edwin Poots: Fallout from DUP leader's resignation continues