A North Carolina boy who was found dead at a wilderness therapy camp for troubled youth likely died of suffocation in a tent with a broken zipper, a new state report says.

A state inspection report offers new details on the hours leading up to a 12-year-old’s death at Trails Carolina, a camp for troubled adolescents.

Camp staff failed to check on the child adequately during night rounds, according to the health department report. The boy was in a small one-person tent that staff says was heavily zipped up and covered at the time.

The 12-year-old boy had been required to sleep in a tube-like tent, enclosed by a solid plastic sheet. Upon discovering that the zipper for the tent was broken, the report says, "staff needed a zip tie out of the tool bag.