Police say a 4-year-old boy in Texas managed to start a van then run over a woman and her 3-week-old child, killing the newborn.

Police Cmdr. Chris Havens says the mother was hospitalized after the accident Thursday night in Burleson, 10 miles south of Fort Worth.

Havens did not identify those involved in the accident nor provide details of the mother's condition.

He says the 4-year-old climbed behind the wheel of the vehicle, started the van and put it in gear. He had a 5-year-old passenger.

Police say the woman saw what was happening and ran outside with her baby in her arms to try to stop the van. Police did not explain the relationship between the woman and the children in the vehicle.