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COLLIN COUNTY, Texas -- A toddler was killed Sunday afternoon when she was run over by a pickup truck in the Collin County community of Westminster.

The Collin County Sheriff s Office said the truck started rolling after the girl s four-year-old brother got into the cab and turned on the ignition.

The 16-month-old girl was killed instantly.

Investigators said the family had been loading items in the pickup to take to a relative s house. The truck was backed up in the driveway near a side door; the childrens father was inside the house when he heard the sound of the motor.

The dad looked outside and saw the truck rolling toward a neighbor s fence. He ran after it, but did not get there before it hit the child and the fence.

The name of the victim was not released.

Westminster is an unincorporated community about 14 miles northeast of McKinney.

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