OXFORD, Mass. (AP) — A woman was killed and an 8-month-old baby was hospitalized on life support after a head-on crash Monday between a car and a cement truck that also left a toddler and three other people injured, state police said.

The 8:30 a.m. accident in the central Massachusetts town of Oxford closed a stretch of busy Route 20 for much of the day as investigators tried to piece together what happened and clean up cement that spilled from the truck, which rolled on its side after impact.

State police said in a statement that a preliminary investigation determined that a Chevrolet Cavalier driven by a 31-year-old Sturbridge woman crossed the center lane for unknown reasons and collided with the truck traveling in the opposite direction.

The force of the crash pushed the car into a third vehicle.

The driver of the Cavalier, whose name has not been released, was pronounced dead at the scene.

State police said two children were in the car with the woman — an 8-month-old boy who had critical injuries and was on life support at UMass Medical Center, and a 2-year-old boy who was hospitalized with serious injuries.

Citing policy, state police said they would not discuss the relationship between the children and the woman.

The driver of the cement truck, a 34-year-old Oxford man, and two Southbridge residents in the third vehicle were taken to hospitals with injuries that were not considered life threatening, officials said.

The truck was owned by Sterling Concrete Corporation.

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This story has been corrected with new information from state police that one of two people initially said to have died is alive on life support.