A Colorado man faces traffic-related charges after his truck collided with another vehicle at the scene of a fatal two-vehicle crash near Fort Qu'Appelle, Sask.

RCMP had closed a section of Highway 10 on Saturday as a result of the fatal crash, which took place at around 11 a.m. CST.

Three passengers inside one vehicle — a 44-year-old woman, a 10-year-old girl, and a six-year-old boy — were killed in the collision, about eight kilometres east of Fort Qu'Appelle.

The driver of their vehicle was injured, as was a passenger inside the second vehicle. The driver of the latter vehicle was not hurt, police said at the time.

As officers investigated the collision, eastbound and westbound traffic were diverted through Highway 56 for much of the day.

About an hour after the first crash, a Ford pickup truck driven by a 23-year-old man from Eire, Colorado, approached the junction of highways 10 and 56 and tried to drive westbound on Highway 10, according to RCMP.

Once he realized he had taken a wrong turn, the man made a U-turn in an attempt to go east, but he failed to slow down as he approached emergency vehicles and crews that were at the scene.

As a result, the pickup truck crashed with an eastbound vehicle that was trying to turn onto Highway 56, police said in a release Monday.

Five people inside the eastbound vehicle were treated by paramedics at the scene, while a 38-year-old male passenger in the truck was taken to hospital in Indian Head with non-life-threatening injuries.

The driver of the pickup truck has been charged under the provincial Traffic Safety Act with driving without a valid driver's licence, driving without due care, and failing to yield to emergency vehicles.

RCMP have not named the three people who died in the first crash, saying on Monday that their family members have not given them permission to release their names.