NEVADA CITY  (AP) — Fire officials say eight people were injured when a canoe that was converted into a gravity-powered car crashed at a Northern California summer camp.

The crash at Camp Augusta in Nevada City occurred around noon on Thursday. Nevada City is about 60 miles northeast of Sacramento.

The injured included teens. Grass Valley Fire Battalion Chief Mark Buttron says two of the injured were transported via air ambulance with moderate injuries. Buttron says the others either went to the hospital by ground ambulance or in private vehicles with bumps, bruises and scrapes.

Buttron says he does not know exactly what led to the crash, but the non-motorized canoe was carrying the eight people and going downhill. It was overturned when crews arrived at the scene.

A call to the camp was not immediately returned.