MELVILLE, Sask. - Three people are dead following a Christmas morning crash on a Saskatchewan highway.

RCMP say a 51-year-old woman, 48-year-old man and 16-year-old boy were in an SUV that was struck head-on by a half-ton truck that investigators believe crossed the centre line on Highway 10 west of Melville.

The 18-year-old woman who was driving the SUV was taken to hospital with undetermined injuries.

All are from the Balcarres, Sask., area.

The driver and lone occupant of the truck, a 26-year-old man from the Yorkton, Sask., area, was treated and released at the scene.

RCMP say they are still investigating the crash.