More than 500 Native American children died in US government-run boarding schools at which students were physically abused and denied food, a report from the US Department of the Interior revealed on Wednesday.

The report found that "approximately 19 Federal Indian boarding schools accounted for over 500 American Indian, Alaska Native, and Native Hawaiian child deaths."

"The Department expects that continued investigation will reveal the approximate number of Indian children who died at Federal Indian boarding schools to be in the thousands or tens of thousands," it mentioned.

According to the report, there are marked or unmarked burial sites at more than 50 locations, out of a total of more than 400 that made up the Federal Indian boarding school system between 1819 and 1969.

"Older Indian children punish younger Indian children"

The US Ministry's report describes abusive punishments imposed at the schools but does not specifically link them to the deaths.

It detailed that "federal Indian boarding school rules were often enforced through punishment, including corporal punishment such as solitary confinement; flogging; withholding food; whipping; slapping; and cuffing. The Federal Indian boarding school system at times made older Indian children punish younger Indian children."

The system "focused on manual labor and vocational skills that left American Indian, Alaska Native, and Native Hawaiian graduates with employment options often irrelevant to the industrial US economy, further disrupting Tribal economies," the report said.

A statement released along with the report highlighted that the school system had the "twin goals of cultural assimilation and territorial dispossession of Indigenous peoples through the forced removal and relocation of their children."

"Heartbreaking and undeniable"

US Secretary of the Interior Deb Haaland, who ordered the investigation that led to the report, condemned the traumatic impact on Native Americans that the boarding school system caused.

In a statement, Haaland expressed that "the consequences of federal Indian boarding school policies -- including the intergenerational trauma caused by the family separation and cultural eradication inflicted upon generations of children as young as four years old -- are heartbreaking and undeniable."

Similarly, Deborah Parker, of the National Native American Boarding School Healing Coalition, highlighted the devastating long-term consequences of the schools.

"After generations, we still do not know how many children attended. How many children died... how many children were permanently scarred for life because of these federal institutions," Parker told a news conference.

"Our children deserve to be found, our children deserve to be brought home. We are here for their justice. And we will not stop advocating until the United States fully accounts for the genocide committed against Native children," she stressed.

Canada is also grappling with the legacy of abuse and neglect at its schools for Indigenous children.

From 1831 till 1996, thousands died at the schools, and many were subjected to physical and sexual abuse, according to an investigative commission that concluded the Canadian government engaged in "cultural genocide".