An arrest warrant says a driver accused of intentionally running over pedestrians in Tennessee, killing a pregnant mother and her toddler son, told police that a voice was directing his actions.

The Knoxville News Sentinel reports 33-year-old William David Phillips told Jefferson City police that a voice told him that he needed to "kill meth addicts" and that the baby stroller the woman was pushing had meth in it "so he intentionally drove into (the mother and child) ... killing them both," the warrants read.

Police say Phillips struck and killed 30-year-old Sierra Wilson Cahoon, who was pregnant, and her 2-year-old son Nolan, at random Monday afternoon. After striking mother and child, Phillips crashed into a fish hatchery.

It's unclear whether Phillips has an attorney. He's scheduled to be arraigned Thursday.

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Information from: Knoxville News Sentinel, http://www.knoxnews.com