More than a year after sensational stories broke about mass graves at a residential school in British Columbia, no human remains have been found at the site.

Initial reports, which suggested that hundreds of children had been buried at the Kamloops Indian school, have never been verified. The ground has not been excavated, and there is a lively debate over whether the site holds any graves at all.

The stories of unmarked mass graves helped to prompt demands for an apology from the Church, leading to the current “penitential pilgrimage” by Pope Francis.