RCMP say a 41-year-old man was supervising the girls when the 1994 Jeep YJ overturned on Causeway Forest Service Road about six kilometres from Mackenzie just before 7 p.m. PT Friday.
Everyone involved was from the local community, which has been hit hard by the incident, Sgt. Syd Lecky, the Mackenzie RCMP Detachment Commander, said in a statement issued on Monday morning.
"The impact on the community and in our elementary and high schools has been significant," said Lecky. "Investigators and RCMP Victim Assistance workers continue to work with the community in providing support to the affected families."
No other details about the incident have been released by police.