A 53, 37 and 35-year-old woman were all killed just east of Lloydminster early Friday morning after the mini-van they were in collided with a heavy-duty, flat deck truck that had been reported stolen on Thursday.
Maidstone RCMP say they were called to the scene five kilometers east of Lloydminster on Highway 16 just after 3:00 a.m. on Friday.
The two younger women were pronounced dead at the scene while the 57-year-old woman later succumbed to her injuries.
A fourth occupant of the mini-van, a 32-year-old woman was air-lifted to an Edmonton Hospital with undetermined injuries.
Police say a 26-year-old man is in custody involving the stolen truck.
The investigation is continuing to determine if any other suspects were involved.
RCMP say the roadway has been fully re-opened.