A city teacher is facing assault charges for allegedly slapping a student.

Fatai Okunola, 50, was arrested Thursday after police say he attacked a 12-year-old student in a Bronx school. 

Sources at the Department of Education say he has been disciplined twice before.

The DOE calls the allegations unacceptable, saying in a statement, "This individual has been removed from the school and reassigned away from students pending the resolution of this criminal matter."