A deranged Tennessee motorist intentionally mowed down and killed a pregnant mom and her stroller-bound toddler and injured two others because he was on a mission to “kill meth addicts,” police and reports say.

William David Phillips, 33, of Jefferson City told cops that “a voice told him that he needed to go kill meth addicts so he began driving very fast” when he committed the heinous act Monday afternoon, the Knoxville News Sentinel reported, citing arrest warrants.

Phillips was slapped with murder charges in the deaths of Sierra Wilson Cahoon, 30, her 2-year-old son, Nolan Cahoon, and her unborn child, authorities said.

According to police, Phillips was driving along East Main Street in Jefferson City around 3:30 p.m. when he swerved and intentionally hit a 61-year-old pedestrian identified as Tillman Gunter with his Chevy Impala.

He then drove less than a mile, and again swerved and deliberately rammed his car into Cahoon and her son, whom she was pushing in a stroller, before crashing the vehicle into a nearby building that houses a fish hatchery, where an employee inside suffered minor injuries, cops said.

“The preliminary investigation has revealed that this was an intentional act of violence toward randomly chosen pedestrians,” the Jefferson City Police Department said in a statement.

“Investigators have determined that Phillips did not know the victims,” the department said.

According to the arrest warrants, Phillips told police that a voice in his head “told him that the baby stroller had meth in it so he intentionally drove into [the mother and child] … killing them both,” the Knoxville News Sentinel reported. “This act was done with premeditation.”

Cahoon and her son were pronounced dead at the scene, while Gunter and the fish store employee were taken to an area hospital with non-life-threatening injuries, authorities said.

“Maybe it hasn’t really registered yet that that could’ve killed me,” the injured employee, identified as Katie McCord, told NBC affiliate WBIR.

The owner of the store, John Carberry, told the news outlet that Phillips “penetrated the building” and took out an estimated tens of thousands of ornamental fish, but noted that that is not what matters.

“Nothing is comparable to the grief we feel for the family and community,” Carberry told WBIR. “Just a young woman out with her son, pregnant, taking a walk on a sunny afternoon, and murdered.”

Phillips was arrested and slapped with three counts of first-degree murder and one count of attempted first-degree murder. He remains jailed without bond.

Cahoon and Nolan were the wife and son of Matt Cahoon, an assistant athletic trainer at the local Carson-Newman University, the Knoxville News Sentinel reported.