The car in the fatal rollover was towed from the ditch and taken to Lestock. ((Dani Mario/CBC))

A Saskatchewan First Nation is grieving after the death Sunday night of three young people in a rollover accident near Lestock, Sask.

The victims include two girls, both 10 years old, and an 18-year-old man, all from Muskowekwan First Nation, which is near Lestock.

Surviving the accident was a 14-year-old boy from the reserve who tried to save the other three after the car missed a turn and flipped into a water-filled ditch.

The crash occurred on a road known to locals as Pudding Hill Road, about five kilometres north of the town, at around 7:50 p.m. CST, the RCMP said.

The 14-year-old, whom police identified as Chase Moise, managed to pull the 18-year-old driver out of the submerged car. He got him on top of the overturned vehicle and performed CPR.

The driver briefly regained consciousness but eventually died of his injuries, the RCMP said.

The 14-year-old also tried to save the two girls, going into the submerged car and removing their seat belts. However, they were pinned and he wasn't able to get them out.

Boy ran for help

He then ran to a nearby house and called 911. The RCMP arrived and pulled the girls out, but they were pronounced dead at the scene.

People in the community told CBC News that the four had been attending a trail ride before the crash.

As word spread, some people from the community stopped by the crash site Monday to pay their respects.

Vanessa Campeau paid tribute to the driver of the car: a rodeo bullrider who's well-known in the community.

" I know people say, 'Why, why did this have to happen to him?' He was a very good boy and was never in trouble or anything," she said.

Police identified one of the victims as Kyria Moise, 10. They didn't say how she's related to Chase Moise. Police haven't named the other two victims.

Officers and an accident reconstructionist continue to investigate.

Lestock is about 140 kilometres northeast of Regina.