A public school teacher in Georgia has been placed on administrative leave after he allegedly threatened a student late last month.

A video taken from the classroom of the Rockdale Career Academy in Conyers shows the teacher telling a student not to "screw" with him, or he will "get in big-a-- trouble."

ABC News reports that the teacher said, "Don't smile at me, man, OK? That's how people like you get shot." The teacher, who is white, told the student, who is black. "I got a bet. I bet by the time you're 21, somebody's gonna put a bullet right through your head. And it might be me -- the one that does it."

The students mother, April Carr told ABC Atlanta affiliate WSB-TV that the physics teacher made the comments after her son and other students laughed as he wrote an equation on the board.

Carr said the teacher then walked over to Carr's son and began his rant, adding that there was "no back and forth" or "disrespectful" banter between her son and his teacher.

Carr said the teacher's comments were "outright racist."