There must be some story behind it.

‘Horrible History’: Mass Grave of Indigenous Children Reported in Canada

“An Indigenous community says it has found evidence that 215 children were buried on the grounds of a British Columbia school, one of the many in Canada set up to forcibly assimilate them.”
https://www.nytimes.com/2021/05/28/world/canada/kamloops-mass-grave-residential-schools.html